{"title":"Athena","description":"\u003ch2\u003eItalian Engineering Excellence Since 1973\u003c\/h2\u003e\n\n\u003cp\u003eAthena S.p.A. was founded in 1973 when Giovanni Mancassola established a small workshop in Alonte, Italy to manufacture engine gaskets. He named his company after the Greek goddess of war—a bold declaration of intent to dominate the industry. Over fifty years later, Athena has grown into an international group with approximately 1,000 employees, facilities in Italy, Spain, Brazil, India, China, and the United States, and €160 million in annual revenue. The company is an official OEM supplier to Ducati, Fantic, KTM, Piaggio, and Triumph, developing electronic control units, gaskets, and cylinders for these leading manufacturers.\u003c\/p\u003e\n\n\u003cp\u003eIn 2000, Athena acquired Eurocilindro and entered the motocross cylinder market. Just four years later, Athena cylinders won their first world championship with legendary rider Stefan Everts claiming the MX1 title. The company then acquired GET, an electronics division dedicated to developing CDIs and ECUs for the powersports industry. Today, Athena offers a complete ecosystem of engine components and electronics tested with the best teams in MXGP and AMA championships.\u003c\/p\u003e\n\n\u003ch3\u003eGasket Kits\u003c\/h3\u003e\n\n\u003cp\u003eWith over 7,000 gasket kits and loose seals available, Athena has been a world leader in gasket production for over 40 years. The R\u0026amp;D team uses only quality raw materials with certified production, constantly developing the best sealing materials for different thermal and mechanical stress applications. Gasket types include rubberized sheets, reinforced materials, asbestos-free compounds, and paper—each selected for specific temperature and pressure requirements.\u003c\/p\u003e\n\n\u003cp\u003eComplete engine gasket kits include all essential components for engine overhaul. Top end gasket kits cover head and thermal section rebuilds. Engine oil seal series provide all seals required for overhaul. Water pump gasket kits include everything needed for water pump repair. Multi-layered gaskets feature Gas-Stopper technology to prevent combustion chamber leakage. Laser cutting and die stamping ensure precision across single and multi-layer configurations.\u003c\/p\u003e\n\n\u003ch3\u003eCylinder Kits\u003c\/h3\u003e\n\n\u003cp\u003eAthena cylinders are entirely engineered in Italy by the R\u0026amp;D department using cutting-edge design tools and rigorous testing protocols. All cylinders are coated with Motor-Nicksil—a proprietary nickel-silicon coating developed by Athena for optimal smoothness and wear resistance. Technology derived from F1 and MotoGP teams is applied throughout the manufacturing process.\u003c\/p\u003e\n\n\u003cp\u003eStandard Bore Cylinder Kits provide OEM-equivalent replacement with exceptional reliability. Big Bore Cylinder Kits increase displacement for serious performance gains. Each kit includes the aluminum alloy cylinder, forged piston with pin and rings, and all necessary gaskets. Components are validated through severe bench and road testing before release. Installation requires no modifications to engine crankcases.\u003c\/p\u003e\n\n\u003cp\u003eForged aluminum pistons feature reverse extrusion forging, molybdenum disulfide screen-printed coating for reduced friction, and precision CNC machining. Undercrown designs combine fatigue resistance with optimal cooling. Piston rings are manufactured in Japan from special steel with chromium nitride PVD coating for low friction and extended life.\u003c\/p\u003e\n\n\u003ch3\u003eGET Electronics\u003c\/h3\u003e\n\n\u003cp\u003eGET is Athena's electronic division, a leading manufacturer of ECUs and data acquisition systems for two, three, and four-wheel vehicles. The team of experienced designers and engineers provides software, hardware, vehicle analysis, testing, technical consultancy, and training. GET products power championship-winning bikes in MXGP, AMA Supercross, and AMA Motocross.\u003c\/p\u003e\n\n\u003cp\u003eSX1 PRO ECUs represent the pinnacle of motorcycle electronics for 2-stroke and 4-stroke fuel-injected engines. Features include cutting-edge 32-bit ST processors, built-in barometric pressure sensors for automatic elevation compensation, and full CANbus functionality. Wi-Fi COM allows smartphone tuning of injection, ignition timing, and rev limits without laptops. Monitor 2.0 displays real-time OBD2 data including RPM, coolant temp, intake air temp, battery voltage, and barometric pressure.\u003c\/p\u003e\n\n\u003cp\u003eRX1 PRO ECUs deliver plug-and-play performance with pre-installed racing mappings optimized for standard engines with racing exhausts. Compatible with Maya programming software for complete customization of injection timing, ignition timing, rev limiters, and electronic gear shift cut-off times. GPA traction control technology manages power delivery without additional sensors. LC-GPA launch control integrates with traction control for optimal starting strategy.\u003c\/p\u003e\n\n\u003cp\u003eCDI ECUs for carbureted 2-stroke engines remain the best-selling units in their market segment, providing reliable ignition control for older platforms.\u003c\/p\u003e\n\n\u003ch3\u003eAdditional Components\u003c\/h3\u003e\n\n\u003cp\u003eAthena offers crankshafts, connecting rods, engine bearings, and piston rings manufactured with CNC machining and cutting-edge equipment. Fork seals, oil seals, and valve seals provide OEM-quality replacement for suspension and engine applications. V-belts, air filters, and crankcases round out the comprehensive catalog covering virtually every engine rebuild need.\u003c\/p\u003e\n\n\u003ch3\u003eQuality \u0026amp; Testing\u003c\/h3\u003e\n\n\u003cp\u003eAthena conducts thorough FEM analyses to simulate component stiffness and strength. Fuji paper testing monitors pressure distribution on sealing surfaces for perfect mounting and optimal sealing efficiency. All products undergo bench testing and track testing with championship-level racing teams before release. The combination of tradition, research, and development delivers products trusted by professionals worldwide.\u003c\/p\u003e\n\n\u003ch3\u003eVehicle Coverage\u003c\/h3\u003e\n\n\u003cp\u003eWe stock Athena gaskets, cylinder kits, and electronics for Honda, Yamaha, Kawasaki, Suzuki, KTM, Husqvarna, Gas Gas, Beta, Sherco, Fantic, Ducati, Triumph, and more. From 50cc scooters to 450cc motocross machines, Athena has engine components engineered for your application.\u003c\/p\u003e\n\n\u003cp\u003eShop the complete Athena collection at Dune Goons. Fast shipping from Oregon.\u003c\/p\u003e","products":[{"product_id":"banshee-athena-68mm-cylinders-392-big-bore-complete-rebuilt-motor-engine-rebuild","title":"Banshee 392cc Athena 68mm Big Bore Engine Rebuild Kit (Stock Crank) (1987-2012)","description":"\u003cp\u003eUnleash legendary Banshee power with this complete top and bottom end rebuild kit, combining the precision of Athena's 68 mm Big Bore Cylinder Kit with the proven durability of Hot Rods' Bottom End Kit.This all-in-one package delivers everything needed for a full performance rebuild - from crankshaft to cylinders - giving your twin-cylinder 350 the torque, throttle response, and reliability it deserves.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha Banshee YFZ350 (1987-2012)\u003c\/li\u003e\n\u003cli\u003eDirect bolt-on kit for all years and editions\u003c\/li\u003e\n\u003cli\u003eWorks with stock or aftermarket carbs, reeds, and exhausts\u003c\/li\u003e\n\u003cli\u003eNo case boring required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComplete top \u0026amp; bottom rebuild - everything from crank to head\u003c\/li\u003e\n\u003cli\u003eGenuine Athena \u0026amp; Hot Rods performance components\u003c\/li\u003e\n\u003cli\u003e68 mm big bore delivers stronger mid-range and peak power\u003c\/li\u003e\n\u003cli\u003eHigh-flow power valves and precision-fit pistons\u003c\/li\u003e\n\u003cli\u003eOEM-quality gaskets for long-term sealing integrity\u003c\/li\u003e\n\u003cli\u003ePerfect base for mild trail or full dune-race builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena 68 mm Big Bore Top End Kit (P400485100024)\u003c\/li\u003e\n\u003cli\u003eAluminum cylinders with nickel-carbide plating\u003c\/li\u003e\n\u003cli\u003eBillet aluminum head with removable bronze domes\u003c\/li\u003e\n\u003cli\u003e(2) 68 mm cast-lite flat-top piston kits (rings, pins, clips)\u003c\/li\u003e\n\u003cli\u003eHigh-performance hard-anodized power valves (non-OEM design)\u003c\/li\u003e\n\u003cli\u003eTop-end gasket set with all seals and hardware\u003c\/li\u003e\n\u003cli\u003eHot Rods Bottom End Kit (CBK0039)\u003c\/li\u003e\n\u003cli\u003eComplete assembled crankshaft\u003c\/li\u003e\n\u003cli\u003eMain bearings and crank seals\u003c\/li\u003e\n\u003cli\u003eFull bottom-end gasket set for complete rebuild coverage\u003c\/li\u003e\n\u003cli\u003eReady to install - no case machining required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Dune Goons @ WPS","offers":[{"title":"Yes I'll do the Cool head upgrade please \/ Yes I need to get Valves too please","offer_id":47291793834209,"sku":"284383227009","price":2689.0,"currency_code":"USD","in_stock":true},{"title":"Yes I'll do the Cool head upgrade please \/ No I already have a good upgraded valve to go with this setup.","offer_id":47291793866977,"sku":"284383227010","price":2149.0,"currency_code":"USD","in_stock":true},{"title":"No the Athena Head will work great with this setup \/ Yes I need to get Valves too please","offer_id":47291793899745,"sku":"284383227011","price":2397.0,"currency_code":"USD","in_stock":true},{"title":"No the Athena Head will work great with this setup \/ No I already have a good upgraded valve to go with this setup.","offer_id":47291793932513,"sku":"284383227012","price":1890.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/banshee-392cc-athena-68mm-big-bore-engine-rebuild-kit-stock-crank-6123419.jpg?v=1763570113"},{"product_id":"21-22-kx-450-f-piston-kit-with-gaskets-kx450f-athena","title":"21-22 KX 450 F Piston Kit with Gaskets - 95.97 mm - KX450F - Athena","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2021-2022 Kawasaki KX450F\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMade of high-performance aluminum alloy with high silicon content that guarantee the same reliability of the OE piston, while at the same time providing greater resistance and excellent performance\u003c\/li\u003e\n\u003cli\u003eThe smooth profile ensures a regular flow and the perfect flame propagation\u003c\/li\u003e\n\u003cli\u003eThe pistons for 4-stroke Off-Road motorcycles are made by reverse extrusion and produced numerical control (CNC) machines\u003c\/li\u003e\n\u003cli\u003ePiston rings create less friction with the cylinder and therefore a higher performance. The segments included, made in Japan, have a wear-resistant coatings (PVD or chromium nitride) to increase the retain and the durability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e21-22 KX 450 F Piston Kit with Gaskets - 95.97 mm - KX450F - Athena\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Specs:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eType: Top End\u003c\/li\u003e\n\u003cli\u003ePiston Material: Aluminum Alloy \/ Forged\u003c\/li\u003e\n\u003cli\u003eBore Size: 95.97 MM\u003c\/li\u003e\n\u003cli\u003eCompression Ratio: 12.5:1\u003c\/li\u003e\n\u003cli\u003eDisplacement: 450 CC\u003c\/li\u003e\n\u003cli\u003eEngine Type: 4-STROKE\u003c\/li\u003e\n\u003cli\u003eRiding Style: OFF-ROAD\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":44345055641825,"sku":"0903-1750","price":263.07,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/21-22-kx-450-f-piston-kit-with-gaskets-9597-mm-kx450f-athena-3618492.png?v=1763570730"},{"product_id":"21-22-kx-450-f-piston-kit-with-gaskets-95-98-mm-kx450f-athena","title":"21-22 KX 450 F Piston Kit with Gaskets - 95.98 mm - KX450F - Athena","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2021-2022 Kawasaki KX450F\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMade of high-performance aluminum alloy with high silicon content that guarantee the same reliability of the OE piston, while at the same time providing greater resistance and excellent performance\u003c\/li\u003e\n\u003cli\u003eThe smooth profile ensures a regular flow and the perfect flame propagation\u003c\/li\u003e\n\u003cli\u003eThe pistons for 4-stroke Off-Road motorcycles are made by reverse extrusion and produced numerical control (CNC) machines\u003c\/li\u003e\n\u003cli\u003ePiston rings create less friction with the cylinder and therefore a higher performance. The segments included, Made in Japan, have a wear-resistant coatings (PVD or chromium nitride) to increase the retain and the durability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e21-22 KX 450 F Piston Kit with Gaskets - 95.98 mm - KX450F - Athena\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Specs:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eType: Top End\u003c\/li\u003e\n\u003cli\u003ePiston Material: Forged \/ Aluminum Alloy\u003c\/li\u003e\n\u003cli\u003eBore Size: 95.98 MM\u003c\/li\u003e\n\u003cli\u003eCompression Ratio: 12.5:1\u003c\/li\u003e\n\u003cli\u003eDisplacement: 450 CC\u003c\/li\u003e\n\u003cli\u003eEngine Type: 4-STROKE\u003c\/li\u003e\n\u003cli\u003eRiding Style: OFF-ROAD\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":44345068683489,"sku":"0903-1751","price":263.07,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/21-22-kx-450-f-piston-kit-with-gaskets-9598-mm-kx450f-athena-2040420.png?v=1763569999"},{"product_id":"97-04-yamaha-yz125-yz-125-54mm-54-athena-stock-bore-cylinder-top-end-piston-kit","title":"Yamaha YZ125 Athena Stock Bore Cylinder Kit (1997-2004)","description":"\u003cp\u003eRestore your Yamaha YZ125's factory performance and reliability with this complete Athena Stock Bore Cylinder Kit. Designed for 1997-2004 models, this 54mm top end rebuild kit includes everything you need for a proper refresh - cylinder, piston, gaskets, head, power valves, and hardware. Built with precision-machined aluminum and nickel-carbide coating, it's the strongest, most complete OEM-style solution on the market.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha YZ125 (2-Stroke)\u003c\/li\u003e\n\u003cli\u003e1997 YZ125\u003c\/li\u003e\n\u003cli\u003e1998 YZ125\u003c\/li\u003e\n\u003cli\u003e1999 YZ125\u003c\/li\u003e\n\u003cli\u003e2000 YZ125\u003c\/li\u003e\n\u003cli\u003e2001 YZ125\u003c\/li\u003e\n\u003cli\u003e2002 YZ125\u003c\/li\u003e\n\u003cli\u003e2003 YZ125\u003c\/li\u003e\n\u003cli\u003e2004 YZ125\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStock bore 54mm (125cc) for OEM-spec rebuilds\u003c\/li\u003e\n\u003cli\u003eAluminum cylinder with nickel-carbide plating for durability\u003c\/li\u003e\n\u003cli\u003eIncludes high-performance Athena power valves (cannot use OEM valves)\u003c\/li\u003e\n\u003cli\u003eCylinder head with removable bronze dome insert for optimal combustion and anti-detonation\u003c\/li\u003e\n\u003cli\u003eComplete kit with piston, gaskets, studs, and hardware\u003c\/li\u003e\n\u003cli\u003eBolt-on installation, no case machining required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena 54mm OEM Stock Bore Nikasil Cylinder (125cc)\u003c\/li\u003e\n\u003cli\u003eAthena Coated Piston Kit (piston, rings, wrist pin, circlips)\u003c\/li\u003e\n\u003cli\u003eAthena Complete Top End Gasket Set (all seals and hardware)\u003c\/li\u003e\n\u003cli\u003eAthena Cylinder Head w\/ removable bronze dome insert\u003c\/li\u003e\n\u003cli\u003eAthena High-Performance Hard Anodized Power Valves (OEM valves not compatible)\u003c\/li\u003e\n\u003cli\u003eAthena Head Stud Kit\u003c\/li\u003e\n\u003cli\u003eAll parts brand new and backed by Athena warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":45253776343265,"sku":"400485100003","price":1110.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/yamaha-yz125-athena-stock-bore-cylinder-kit-19972004-5789048.jpg?v=1763570271"},{"product_id":"97-04-yamaha-yz125-yz-125-58mm-144cc-athena-big-bore-cylinder-top-end-piston-kit","title":"Yamaha YZ125 144cc Athena Big Bore Kit (1997-2004)","description":"\u003cp\u003eUpgrade your Yamaha YZ125 into a 144cc powerhouse with the Athena Big Bore Kit. This race-proven package includes everything you need for a full top-end rebuild, engineered for more horsepower, stronger torque, and factory-level reliability. Designed with precision machining and premium materials, it's the ultimate bolt-on performance kit for riders who want to take their YZ125 to the next level.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha YZ125 (2-stroke) 1997-2004\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncreases displacement from 125cc to 144cc for more power across the RPM range\u003c\/li\u003e\n\u003cli\u003eAluminum cylinder with nickel-carbide coating for maximum durability\u003c\/li\u003e\n\u003cli\u003eHigh-performance anodized Athena power valves included (OEM valves will not work)\u003c\/li\u003e\n\u003cli\u003eRace-designed piston and gasket set for reliable compression and sealing\u003c\/li\u003e\n\u003cli\u003eDirect-fit kit with OEM-level reliability and service life\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena 58mm Nikasil Big Bore Cylinder (144cc)\u003c\/li\u003e\n\u003cli\u003eAthena Coated Piston Kit (Piston, Rings, Wrist Pin, Circlips)\u003c\/li\u003e\n\u003cli\u003eAthena Complete Top End Gasket Set\u003c\/li\u003e\n\u003cli\u003eAthena Cylinder Head w\/ Bronze Dome Insert\u003c\/li\u003e\n\u003cli\u003eAthena Head Stud Kit\u003c\/li\u003e\n\u003cli\u003eAthena High-Performance Power Valves (cannot use OEM)\u003c\/li\u003e\n\u003cli\u003eAll components brand new and covered by Athena's warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":45263754264801,"sku":"Fixed-0931-0258","price":900.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/yamaha-yz125-144cc-athena-big-bore-kit-19972004-5342570.webp?v=1763570270"},{"product_id":"athena-big-bore-kit-289cc-for-crf250r-crf250rx-18-24","title":"Athena Big Bore Kit 289cc for CRF250R \u0026 CRF250RX (18-24)","description":"\u003cp\u003eFits Honda CRF250R (2018-2024) \u0026amp; CRF250RX (2019-2024)Displacement: 289cc | Bore Size: 85.00 mm | Compression: 13.7:1 Boost your Honda's power with the Athena 289cc Big Bore Race Cylinder Kit - designed for serious off-road riders demanding maximum output, cooling, and durability. Built to race spec, this kit pushes your engine to the next level with high-performance components and expanded cooling capacity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2018-2024 Honda CRF250R\u003c\/li\u003e\n\u003cli\u003e2019-2024 Honda CRF250RX\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRace-Ready Big Bore Power - Increases displacement to 289cc for serious gains\u003c\/li\u003e\n\u003cli\u003eLarger Water Jackets - Improved cooling for extended performance\u003c\/li\u003e\n\u003cli\u003eForged Piston - Durable and molybdenum-coated for low friction\u003c\/li\u003e\n\u003cli\u003eNickel-Carbide Cylinder Coating - Ultra-tough and built to last\u003c\/li\u003e\n\u003cli\u003eRace Power Valves - Custom designed, hard-anodized, high flow\u003c\/li\u003e\n\u003cli\u003eOEM Fitment - Direct bolt-on fit (except OEM power valves \u0026amp; head)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAluminum Cylinder with Nickel-Carbide Coating (85.00 mm)\u003c\/li\u003e\n\u003cli\u003eForged Piston with Moly Coating\u003c\/li\u003e\n\u003cli\u003eHigh-Performance Anodized Power Valves (not compatible with OEM)\u003c\/li\u003e\n\u003cli\u003eNote: Cylinder head not included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46415228535009,"sku":"0931-0956","price":1008.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-big-bore-kit-289cc-for-crf250r-crf250rx-1824-7860279.jpg?v=1763567944"},{"product_id":"athena-piston-kit-w-gaskets-78-95mm-for-crf250r-rx-20-21","title":"Athena Piston Kit w\/ Gaskets 78.95mm for CRF250R\/RX (20-21)","description":"\u003cp\u003eFits Honda CRF250R (2020-2021) \u0026amp; CRF250RX (2020-2021)Compression Ratio: 14.1:1 | Bore Size: 78.95 mm | Displacement: 250cc Bring back full power - or upgrade it - with this race-spec Athena Piston Kit + Gaskets. Designed for performance and precision, it's ideal for riders who demand durability, low friction, and max output from their 4-stroke engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2020-2021 Honda CRF250R\u003c\/li\u003e\n\u003cli\u003e2020-2021 Honda CRF250RX\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eForged Alloy Piston - Made from high-silicon aluminum for OE-level reliability\u003c\/li\u003e\n\u003cli\u003eCNC Machined - Ensures perfect tolerances and flame propagation\u003c\/li\u003e\n\u003cli\u003eHigh Compression - 14.1:1 ratio boosts performance and responsiveness\u003c\/li\u003e\n\u003cli\u003eLow-Friction Rings - Japanese-made, wear-resistant, race-ready coating\u003c\/li\u003e\n\u003cli\u003eFull Top End Kit - Includes all gaskets for a smooth rebuild\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eForged 78.95mm Athena Piston (Model A)\u003c\/li\u003e\n\u003cli\u003ePiston Rings with PVD or Chromium Nitride Coating\u003c\/li\u003e\n\u003cli\u003eComplete Top-End Gasket Set\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46415230501089,"sku":"0903-1730","price":191.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-piston-kit-w-gaskets-7895mm-for-crf250rrx-2021-6914971.jpg?v=1763569708"},{"product_id":"athena-96mm-cylinder-kit-honda-crf450r-rx-2017-2025","title":"Athena 96mm Cylinder Kit - Honda CRF450R\/RX (2017-2025)","description":"\u003cp\u003eAthena 96mm Cylinder Kit - Honda CRF450R\/RX (2017-2025) Stock Bore | Race-Ready 4-Stroke Performance | Forged Piston + Gaskets If you're pushing your Honda CRF450R or RX to its limits, this Athena stock bore cylinder kit is built to deliver. Designed for serious racers and weekend warriors alike, it blends factory-level porting, premium materials, and top-tier components into one complete, race-ready solution. Skip the guesswork - this kit delivers performance where it matters most.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHonda\u003c\/li\u003e\n\u003cli\u003e2017-2025 CRF450R\u003c\/li\u003e\n\u003cli\u003e2017-2025 CRF450RX\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRace-Ported Performance: Cylinder ported to Factory Works spec.\u003c\/li\u003e\n\u003cli\u003ePremium Coatings: Nickel-carbide plating for superior wear and heat resistance.\u003c\/li\u003e\n\u003cli\u003eForged Piston Included: Domed OEM-style design for optimized combustion.\u003c\/li\u003e\n\u003cli\u003eHigh-Performance Power Valves: Hard-anodized design (non-OEM compatible).\u003c\/li\u003e\n\u003cli\u003eComplete Gasket Set: All required seals and hardware included for top-end assembly.\u003c\/li\u003e\n\u003cli\u003eBuilt for Racing: High compression ratio (13.5:1) and precision engineering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1x Aluminum Cylinder (Nickel-Carbide Coated)\u003c\/li\u003e\n\u003cli\u003e1x Forged OEM-Style Domed Piston Kit\u003c\/li\u003e\n\u003cli\u003e1x Top-End Gasket Set with Required Seals \u0026amp; Hardware\u003c\/li\u003e\n\u003cli\u003ePower Valves (Race Spec - Not Compatible with OEM)\u003c\/li\u003e\n\u003cli\u003eCylinder Head Not Included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Specs:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDisplacement: 450cc\u003c\/li\u003e\n\u003cli\u003eBore Size: 96.00 mm (Stock Bore)\u003c\/li\u003e\n\u003cli\u003eCompression Ratio: 13.5:1\u003c\/li\u003e\n\u003cli\u003eMaterial: Aluminum\u003c\/li\u003e\n\u003cli\u003eCoating: Nickel-Carbide\u003c\/li\u003e\n\u003cli\u003eEngine Type: 4-Stroke\u003c\/li\u003e\n\u003cli\u003eUnits: Kit\u003c\/li\u003e\n\u003cli\u003eStyle: Stock Bore\u003c\/li\u003e\n\u003cli\u003eRiding Style: Off-Road\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46417395810529,"sku":"0931-0957","price":772.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-96mm-cylinder-kit-honda-crf450rrx-20172025-7856851.jpg?v=1763569288"},{"product_id":"banshee-athena-421cc-big-bore-kit-wiseco-pistons-cool-head","title":"Athena 68mm Big Bore Cylinder Kit - Yamaha Banshee 350 (1987-2012)","description":"\u003cp\u003eUpgrade your Yamaha Banshee with the Athena 68mm Big Bore Race Cylinder Kit, taking displacement to 392cc for serious performance gains. This kit includes nickel-carbide - plated aluminum cylinders, a removable bronze dome cylinder head, and Athena's high-performance power valves designed specifically for this kit. Perfect for riders looking for reliable power in the dunes, track, or trail.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha Banshee YFZ350 (1987-2006)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBig Bore setup: increases displacement to 392cc\u003c\/li\u003e\n\u003cli\u003eNickel-carbide - plated aluminum cylinders for durability and heat dissipation\u003c\/li\u003e\n\u003cli\u003eRace-designed hard-anodized power valves (OEM valves not compatible)\u003c\/li\u003e\n\u003cli\u003eCast lite flat-top pistons included\u003c\/li\u003e\n\u003cli\u003eComplete with top-end gaskets, seals, and hardware\u003c\/li\u003e\n\u003cli\u003eDesigned for high-performance 2-stroke Banshee builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e(2) Aluminum cylinders, 68.00mm bore, nickel-carbide coated\u003c\/li\u003e\n\u003cli\u003eCylinder head with removable bronze dome\u003c\/li\u003e\n\u003cli\u003eHigh-performance, hard-anodized power valves (non-OEM)\u003c\/li\u003e\n\u003cli\u003ePiston kit (cast lite flat-top pistons, rings, clips, pin)\u003c\/li\u003e\n\u003cli\u003eComplete Athena top-end gasket set with seals and hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS or PU","offers":[{"title":"Default Title","offer_id":46510867808481,"sku":"68-4944","price":999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-68mm-big-bore-cylinder-kit-yamaha-banshee-350-19872006-7450542.jpg?v=1763568158"},{"product_id":"athena-top-end-gasket-kit-yamaha-yz250f-wr250f-2001-2013","title":"Athena Top End Gasket Kit - Yamaha YZ250F WR250F (2001-2013)","description":"\u003cp\u003eRefresh your engine with Athena's race-ready top end gasket kit - designed for 4-stroke Yamaha 250F motors. This performance-driven kit gives riders compression tuning flexibility with multiple base gaskets included.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha YZ250F: 2001-2013\u003c\/li\u003e\n\u003cli\u003eYamaha WR250F: 2001-2013\u003c\/li\u003e\n\u003cli\u003eGas Gas EC250F: 2013-2015\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena Top End Gasket Kit - Yamaha YZ250F WR250F\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMLSS (Multi-Layer Steel) head gasket\u003c\/li\u003e\n\u003cli\u003ePremium quality base gaskets (multiple thicknesses for compression tuning)\u003c\/li\u003e\n\u003cli\u003eNote: Valve cover gasket, valve stem seals, rubber parts, and fiber gaskets not included.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46521356288225,"sku":"0934-2534","price":71.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-top-end-gasket-kit-yamaha-yz250f-wr250f-20012013-2736066.jpg?v=1764018900"},{"product_id":"athena-top-end-gasket-kit-yfz450-wr450f-yz450f-ec-450f","title":"Athena Top-End Gasket Kit - YFZ450 \/ WR450F \/ YZ450F \/ EC 450F (2006-2019)","description":"\u003cp\u003eDesigned for riders who rebuild their engines midseason or before a race, this Athena Top-End Gasket Kit includes premium multi-layer steel (MLSS) head gaskets and multiple base gasket thicknesses to fine-tune your compression. Whether you're running pump gas or race fuel, this kit gives you the flexibility and reliability you need from a trusted OEM-grade gasket supplier.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2006-2009 Yamaha YZ450F\u003c\/li\u003e\n\u003cli\u003e2007-2014 Yamaha WR450F\u003c\/li\u003e\n\u003cli\u003e2009-2019 Yamaha YFZ450R\u003c\/li\u003e\n\u003cli\u003e2010 Yamaha YFZ450X \/ YFZ450R SE\u003c\/li\u003e\n\u003cli\u003e2017 Yamaha YFZ450\u003c\/li\u003e\n\u003cli\u003e2013-2015 Gas Gas EC 450F\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMulti-layer steel head gasket ensures superior sealing\u003c\/li\u003e\n\u003cli\u003eOptional base gasket thicknesses allow compression tuning\u003c\/li\u003e\n\u003cli\u003eDesigned for pro, semi-pro, and serious amateur riders\u003c\/li\u003e\n\u003cli\u003eOEM-grade materials\u003c\/li\u003e\n\u003cli\u003eIdeal for freshening up top ends between races or mid-season\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMLSS head gasket\u003c\/li\u003e\n\u003cli\u003eMultiple base gaskets of varying thicknesses\u003c\/li\u003e\n\u003cli\u003eIntake\/exhaust and other top-end gaskets\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Does not include valve cover gasket, rubber parts, shims, or fiber gaskets\u003c\/p\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46564441325793,"sku":"0934-2581","price":91.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/D5D1891E-D5E1-402B-AFA1-CC51ADD9BDFF.jpg?v=1750482518"},{"product_id":"athena-big-bore-piston-kit-97-95mm-yfz450r-x","title":"Athena Big Bore Piston Kit - 97.95mm YFZ450R\/X (2004-2013)","description":"\u003cp\u003eAthena Forged Big Bore Piston Kit - 97.95mm (Yamaha YFZ450R\/X) Upgrade your Athena big bore setup with this 97.95mm Forged Piston Kit, designed for max compression, high RPM durability, and serious horsepower. Built from 2618 forged aluminum and tested under racing conditions, this piston is ideal for high-performance YFZ450 builds running Athena big bore cylinders.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2004-2011 Yamaha YFZ450 (carbureted)\u003c\/li\u003e\n\u003cli\u003e2009-2013 Yamaha YFZ450R\u003c\/li\u003e\n\u003cli\u003e2010-2011 Yamaha YFZ450X\u003c\/li\u003e\n\u003cli\u003eDesigned for use with Athena big bore cylinders only\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHigh-strength 2618 forged aluminum construction\u003c\/li\u003e\n\u003cli\u003e12.4:1 compression ratio\u003c\/li\u003e\n\u003cli\u003eOptimized for racing and high-load environments\u003c\/li\u003e\n\u003cli\u003eEngine dyno and track tested under progressive stress\u003c\/li\u003e\n\u003cli\u003eHandles thermal and mechanical extremes\u003c\/li\u003e\n\u003cli\u003eIdeal for 4-stroke ATV performance builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena 97.95mm forged piston\u003c\/li\u003e\n\u003cli\u003ePiston rings\u003c\/li\u003e\n\u003cli\u003eWrist pin\u003c\/li\u003e\n\u003cli\u003eCirclips\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46564445192417,"sku":"0910-2505","price":280.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/15F2F027-591A-4F1E-AD3E-7DFCBBF94952.jpg?v=1750482809"},{"product_id":"honda-trx450r-er-480cc-athena-big-bore-cylinder-kit-100mm-06-14","title":"Honda TRX450R\/ER 480cc Athena Big Bore Cylinder Kit 100mm (06-14)","description":"\u003cp\u003eUpgrade your TRX450R\/ER with the Athena 480cc Big Bore Race Cylinder Kit for maximum power and durability. Featuring a precision-machined aluminum cylinder with a nickel-carbide bore coating, this kit is designed with larger water jackets for improved cooling and comes with a forged piston to withstand extreme performance demands. Perfect for serious riders and racers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHonda TRX450ER Electric Start - 2006-2009, 2012-2014\u003c\/li\u003e\n\u003cli\u003eHonda TRX450R - 2006-2009, 2012\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBore Size: 100.00 mm\u003c\/li\u003e\n\u003cli\u003eDisplacement: 480 cc\u003c\/li\u003e\n\u003cli\u003eCompression Ratio: 11.6:1\u003c\/li\u003e\n\u003cli\u003eDesigned for 4-stroke Honda TRX450R\/ER engines\u003c\/li\u003e\n\u003cli\u003eLarger water jackets for better heat dissipation\u003c\/li\u003e\n\u003cli\u003eRace-ready forged piston with moly coating for reduced friction\u003c\/li\u003e\n\u003cli\u003eLightweight aluminum cylinder construction with nickel-carbide bore coating\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e100.00 mm aluminum cylinder with nickel-carbide coating\u003c\/li\u003e\n\u003cli\u003eForged piston with molybdenum coating\u003c\/li\u003e\n\u003cli\u003eSpecially designed hard-anodized power valves (cannot use OEM)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46765906428129,"sku":"0931-0667","price":1105.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/honda-trx450rer-480cc-athena-big-bore-cylinder-kit-100mm-0614-7234640.jpg?v=1763568591"},{"product_id":"athena-94mm-big-bore-cylinder-kit-dr-z400-lt-z400-klx400-kfx400-dvx400","title":"Athena 94mm Big Bore Cylinder Kit - DR-Z400 \/ LT-Z400 \/ KLX400 \/ KFX400 \/ DVX400 (2000-2016)","description":"\u003cp\u003eBoost your machine to 435cc with the Athena 94mm Big Bore Cylinder Kit. Featuring a precision aluminum cylinder with nickel-carbide coating, this kit improves torque with stock CDI and exhaust, and delivers maximum horsepower gains when paired with a racing exhaust. The forged molybdenum-coated piston ensures durability under high-performance conditions, while the enlarged water jackets improve cooling for sustained performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSuzuki DR-Z400-2000-2016\u003c\/li\u003e\n\u003cli\u003eSuzuki DR-Z400S - 2019\u003c\/li\u003e\n\u003cli\u003eSuzuki DR-Z400SM - 2019\u003c\/li\u003e\n\u003cli\u003eSuzuki LT-Z400 QuadSport Z \/ Z LE \/ SE - 2003-2014, 2008, 2012\u003c\/li\u003e\n\u003cli\u003eKawasaki KLX400-2003-2006\u003c\/li\u003e\n\u003cli\u003eKawasaki KFX400-2003-2006\u003c\/li\u003e\n\u003cli\u003eArctic Cat DVX400-2004-2008\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e94mm bore increases displacement to 435cc\u003c\/li\u003e\n\u003cli\u003e12.3:1 compression ratio for maximum performance\u003c\/li\u003e\n\u003cli\u003eDurable nickel-carbide cylinder bore coating\u003c\/li\u003e\n\u003cli\u003eEnlarged water jackets for better cooling efficiency\u003c\/li\u003e\n\u003cli\u003eForged piston with molybdenum coating for reduced friction\u003c\/li\u003e\n\u003cli\u003eIncludes specially designed power valves (cannot use OEM)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e94mm big bore aluminum cylinder with nickel-carbide coating\u003c\/li\u003e\n\u003cli\u003eForged piston with molybdenum coating\u003c\/li\u003e\n\u003cli\u003eHigh-performance hard-anodized power valves (not OEM compatible)\u003c\/li\u003e\n\u003cli\u003ePiston rings, wrist pin, and circlips\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46772389544161,"sku":"0931-0016","price":1006.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-94mm-big-bore-cylinder-kit-dr-z400-lt-z400-klx400-kfx400-dvx400-5054096.png?v=1764018665"},{"product_id":"athena-complete-gasket-kit-honda-xr650l-nx650-dominator","title":"Athena Complete Gasket Kit - Honda XR650L \/ NX650 Dominator (1988-2009)","description":"\u003cp\u003eThe Athena Complete Gasket Kit is engineered for superior sealing performance on Honda XR650L and NX650 Dominator engines. Featuring head gaskets with rubber-coated spring steel construction and soft steel base gaskets with a durable rubber coating, this kit ensures a perfect seal even under extreme temperatures. High-temperature blue silicone beading is applied to critical flat gaskets for maximum sealing reliability. Ideal for a complete rebuild, it includes top-quality gaskets and rubber parts for both top-end and complete engine overhauls.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHonda XR650L - 1993-2009\u003c\/li\u003e\n\u003cli\u003eHonda NX650 Dominator - 1988-1993\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSuperior-quality gasket sets from Athena\u003c\/li\u003e\n\u003cli\u003eRubber-coated steel head and base gaskets for long-lasting seal\u003c\/li\u003e\n\u003cli\u003eSteel core material with high springback and tensile strength\u003c\/li\u003e\n\u003cli\u003eTransparent coating ensures a perfect seal at high temps\u003c\/li\u003e\n\u003cli\u003eHigh-temp blue silicone beading on critical gaskets\u003c\/li\u003e\n\u003cli\u003eIncludes all gaskets and rubber parts for top-end and complete rebuilds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHead gasket with rubber-coated spring steel construction\u003c\/li\u003e\n\u003cli\u003eRubber-coated soft steel base gaskets\u003c\/li\u003e\n\u003cli\u003eTop-quality gaskets and rubber parts for full engine rebuilds\u003c\/li\u003e\n\u003cli\u003eHigh-temp blue silicone beading on critical gaskets(Oil seals not included)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46772397539553,"sku":"0934-0044","price":133.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-complete-gasket-kit-honda-xr650l-nx650-dominator-1498013.jpg?v=1763567943"},{"product_id":"yamaha-yz125-yz125x-athena-144cc-big-bore-kit-2005-2022","title":"Yamaha YZ125 \/ YZ125X Athena 144cc Big Bore Kit (2005-2022)","description":"\u003cp\u003eTurn your Yamaha YZ125 into a 144cc race weapon with the Athena Big Bore Kit. Designed for 2005-2021 YZ125 and 2020-2022 YZ125X, this kit adds serious horsepower and torque while maintaining OEM-level reliability. Includes all top-end components, from cylinder to piston and gaskets, with Athena's proven engineering and materials.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha YZ125 (2005-2021)\u003c\/li\u003e\n\u003cli\u003eYamaha YZ125X (2020-2022)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBoosts displacement from 125cc → 144cc for major power gains\u003c\/li\u003e\n\u003cli\u003eAluminum cylinder with nickel-carbide coating for maximum durability\u003c\/li\u003e\n\u003cli\u003eIncludes complete Athena top-end kit with piston, gaskets, head, and valves\u003c\/li\u003e\n\u003cli\u003eRace-ready with improved torque and top-end pull\u003c\/li\u003e\n\u003cli\u003eDirect OEM fitment - designed specifically for YZ125 and YZ125X\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena 58mm Nikasil Big Bore Cylinder (144cc)\u003c\/li\u003e\n\u003cli\u003eAthena Coated Piston Kit (Piston, Rings, Wrist Pin, Circlips)\u003c\/li\u003e\n\u003cli\u003eAthena Complete Top End Gasket Set\u003c\/li\u003e\n\u003cli\u003eAthena Cylinder Head w\/ Removable Bronze Dome\u003c\/li\u003e\n\u003cli\u003eAthena Head Stud Kit\u003c\/li\u003e\n\u003cli\u003eAthena High-Performance Anodized Power Valves (OEM valves not compatible)\u003c\/li\u003e\n\u003cli\u003eAll components brand new, covered by Athena's warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46777877790945,"sku":"Fixed-0931-0146","price":900.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/yamaha-yz125-yz125x-athena-144cc-big-bore-kit-20052022-8229967.jpg?v=1763566894"},{"product_id":"yamaha-yz125-yz125x-athena-stock-bore-cylinder-kit-2005-2022","title":"Yamaha YZ125 \/ YZ125X Athena Stock Bore Cylinder Kit (2005-2022)","description":"\u003cp\u003eBring your Yamaha YZ125 back to life with this complete Athena Stock Bore Cylinder Kit. Designed for 2005-2021 YZ125 and 2020-2022 YZ125X, this 54mm OEM-spec top end rebuild kit restores power, improves cooling efficiency, and includes everything you need for a professional-level refresh. Engineered with premium materials and precision machining, this is the most complete OEM-style solution available.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha YZ125 (2005-2021)\u003c\/li\u003e\n\u003cli\u003eYamaha YZ125X (2020-2022)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStock bore 54mm (125cc) for OEM-style rebuilds\u003c\/li\u003e\n\u003cli\u003eAluminum cylinder with nickel-carbide plating \u0026amp; enlarged water jackets for cooling\u003c\/li\u003e\n\u003cli\u003eIncludes Athena high-performance anodized power valves (not OEM compatible)\u003c\/li\u003e\n\u003cli\u003eCylinder head with removable bronze dome for compression tuning \u0026amp; anti-detonation\u003c\/li\u003e\n\u003cli\u003eComplete bolt-on solution, no machining required (unless otherwise noted)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena 54mm OEM Stock Bore Nikasil Cylinder (125cc)\u003c\/li\u003e\n\u003cli\u003eAthena Cast-Lite Flat Top Piston Kit (piston, rings, wrist pin, circlips)\u003c\/li\u003e\n\u003cli\u003eAthena Complete Top End Gasket Set (all seals and hardware)\u003c\/li\u003e\n\u003cli\u003eAthena Cylinder Head w\/ Removable Bronze Dome (anti-detonation, high-compression design)\u003c\/li\u003e\n\u003cli\u003eAthena High-Performance Hard Anodized Power Valves (OEM valves not compatible)\u003c\/li\u003e\n\u003cli\u003eAll brand-new parts backed by Athena warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46777884049633,"sku":"Fixed-0931-0095","price":840.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/yamaha-yz125-yz125x-athena-stock-bore-cylinder-kit-20052022-3603266.jpg?v=1763568158"},{"product_id":"yamaha-yz125-athena-complete-gasket-kit-1999-2004","title":"Yamaha YZ125 Athena Complete Gasket Kit (1999-2004)","description":"\u003cp\u003eKeep your Yamaha YZ125 running strong with this premium Athena Complete Gasket Kit. Designed for 2-stroke engines, this kit includes every gasket you need to rebuild your engine top to bottom. Built with superior materials, Athena gaskets are trusted worldwide for sealing strength, heat resistance, and long-lasting reliability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha YZ125 (1999-2004)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOEM-quality gasket set engineered for Yamaha YZ125\u003c\/li\u003e\n\u003cli\u003eRubber-coated spring steel head gasket for perfect sealing\u003c\/li\u003e\n\u003cli\u003eSoft steel base gaskets provide durability under high compression\u003c\/li\u003e\n\u003cli\u003eTransparent coating ensures reliability even at extreme temps\u003c\/li\u003e\n\u003cli\u003eHigh-temp blue silicone beading on critical flat gaskets\u003c\/li\u003e\n\u003cli\u003eDesigned for complete engine rebuilds (top \u0026amp; bottom end)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComplete Athena Engine Gasket Kit for Yamaha YZ125\u003c\/li\u003e\n\u003cli\u003eHead gasket (rubber-coated spring steel construction)\u003c\/li\u003e\n\u003cli\u003eBase gaskets (soft steel with rubber coating)\u003c\/li\u003e\n\u003cli\u003eAll necessary gaskets and rubber parts for complete engine rebuilds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46777888047329,"sku":"400485850116","price":46.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/yamaha-yz125-athena-complete-gasket-kit-19992004-5969739.jpg?v=1763570000"},{"product_id":"yamaha-yz125-athena-top-end-gasket-kit-1999-2004","title":"Yamaha YZ125 Athena Top End Gasket Kit (1999-2004)","description":"\u003cp\u003eFreshen up your Yamaha YZ125 top end with this Athena Top End Gasket Kit. Designed specifically for 2-stroke rebuilds, this kit includes premium quality gaskets to restore compression, seal strength, and reliability. Ideal for riders who service their top end mid-season or before a race, Athena gaskets are built to handle extreme conditions and high output.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha YZ125 (1999-2004)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for pro, semi-pro, and amateur riders who rebuild mid-season\u003c\/li\u003e\n\u003cli\u003eMLS head gasket provides superior sealing and compression retention\u003c\/li\u003e\n\u003cli\u003eBase gaskets included in multiple thicknesses for compression adjustment\u003c\/li\u003e\n\u003cli\u003eGives the option of running pump gas with stock compression or race gas with higher compression\u003c\/li\u003e\n\u003cli\u003eBuilt for durability in high-performance 2-stroke racing environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena MLS Head Gasket (multi-layered steel construction)\u003c\/li\u003e\n\u003cli\u003eMultiple Premium Base Gaskets (varied thickness for compression tuning)\u003c\/li\u003e\n\u003cli\u003eAdditional high-quality gaskets needed for a top end rebuild\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46777890373857,"sku":"400485600116","price":26.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/yamaha-yz125-athena-top-end-gasket-kit-19992004-8569600.jpg?v=1763567696"},{"product_id":"yamaha-yz125-athena-top-end-gasket-kit-2005-2022","title":"Yamaha YZ125 Athena Top End Gasket Kit (2005-2022)","description":"\u003cp\u003eKeep your Yamaha YZ125 running strong with this Athena Top End Gasket Kit. Designed for 2005-2022 models, this kit provides the essential gaskets for freshening up your top end. Built with MLS (multi-layered steel) head gasket technology and premium base gaskets, Athena delivers the compression reliability and sealing strength needed for racing or regular rebuilds.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha YZ125 (2005-2022)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePurpose-built for pro, semi-pro, and amateur riders\u003c\/li\u003e\n\u003cli\u003eMLS head gasket ensures reliable seal and compression retention\u003c\/li\u003e\n\u003cli\u003eBase gaskets in multiple thicknesses let you fine-tune compression ratio\u003c\/li\u003e\n\u003cli\u003eGives option to run pump gas (stock compression) or race gas (higher compression)\u003c\/li\u003e\n\u003cli\u003eHigh-performance gasket materials withstand extreme temps and pressures\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena MLS Head Gasket (multi-layered steel construction)\u003c\/li\u003e\n\u003cli\u003eMultiple Premium Base Gaskets (varied thicknesses for compression tuning)\u003c\/li\u003e\n\u003cli\u003eAdditional gaskets for a complete top end refresh\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46777891258593,"sku":"0934-0348","price":26.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/yamaha-yz125-athena-top-end-gasket-kit-20052022-4732923.jpg?v=1763566894"},{"product_id":"yamaha-yz125-athena-complete-gasket-kit-2005-2022","title":"Yamaha YZ125 Athena Complete Gasket Kit (2005-2022)","description":"\u003cp\u003eRebuild your Yamaha YZ125 with confidence using the Athena Complete Gasket Kit. Covering both top and bottom end, this premium gasket set includes everything needed to restore sealing strength and reliability across your engine. Built with advanced materials, Athena gaskets are designed for high-performance 2-stroke racing and long-lasting durability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha YZ125 (2005-2022)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOEM-quality complete gasket set for Yamaha YZ125 engines\u003c\/li\u003e\n\u003cli\u003eRubber-coated spring steel head gasket ensures strong sealing under high compression\u003c\/li\u003e\n\u003cli\u003eHigh-temp blue silicone beading applied to critical flat gaskets\u003c\/li\u003e\n\u003cli\u003eSoft steel base gaskets offer high springback and tensile strength\u003c\/li\u003e\n\u003cli\u003eTransparent coating resists extreme heat and ensures long-term durability\u003c\/li\u003e\n\u003cli\u003eDesigned for both top-end and bottom-end rebuilds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComplete Athena Engine Gasket Kit for Yamaha YZ125\u003c\/li\u003e\n\u003cli\u003eHead Gasket (rubber-coated spring steel construction)\u003c\/li\u003e\n\u003cli\u003eBase Gaskets (soft steel, rubber-coated)\u003c\/li\u003e\n\u003cli\u003eAll essential gaskets and rubber components for full engine rebuilds (top \u0026amp; bottom end)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46777892438241,"sku":"0934-0353","price":44.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/yamaha-yz125-athena-complete-gasket-kit-20052022-1976852.jpg?v=1763567086"},{"product_id":"honda-crf250r-rx-athena-stock-bore-cylinder-kit-2018-2019","title":"Honda CRF250R\/RX Athena Stock Bore Cylinder Kit (2018-2019)","description":"\u003cp\u003eBring your Honda CRF250R or CRF250RX back to peak performance with this Athena Stock Bore Cylinder Kit. Featuring a factory-spec 79mm cylinder, forged piston, and complete gasket set, this kit is engineered for maximum durability, compression, and race-ready power. Perfect for riders who demand OEM reliability with Athena's performance edge.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHonda CRF250R (2018-2019)\u003c\/li\u003e\n\u003cli\u003eHonda CRF250RX (2018-2019)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStock bore 79mm (250cc) - 13.9:1 compression ratio\u003c\/li\u003e\n\u003cli\u003eAluminum cylinder with nickel-carbide coating for longevity\u003c\/li\u003e\n\u003cli\u003ePorted to Factory Works specifications for improved airflow and performance\u003c\/li\u003e\n\u003cli\u003eForged piston kit for race-level durability and strength\u003c\/li\u003e\n\u003cli\u003eComplete top end gasket set included\u003c\/li\u003e\n\u003cli\u003eDirect OEM replacement, no head included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena 79mm Nikasil-Coated Cylinder (Stock Bore - 250cc)\u003c\/li\u003e\n\u003cli\u003eAthena Forged OEM-Style Domed Piston Kit (piston, rings, wrist pin, circlips)\u003c\/li\u003e\n\u003cli\u003eAthena Top End Gasket Set (all required seals and hardware)\u003c\/li\u003e\n\u003cli\u003eHigh-Performance Hard Anodized Power Valves (not compatible with OEM valves)\u003c\/li\u003e\n\u003cli\u003eAll brand-new components in original packaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46777893814497,"sku":"0931-0955","price":772.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/honda-crf250rrx-athena-stock-bore-cylinder-kit-20182019-3934921.jpg?v=1763568459"},{"product_id":"yamaha-yz450f-athena-stock-bore-cylinder-kit-2018-2019","title":"Yamaha YZ450F Athena Stock Bore Cylinder Kit (2018-2019)","description":"\u003cp\u003eRestore your Yamaha YZ450F's factory performance with this Athena Stock Bore Cylinder Kit. Designed with a 97mm bore and forged piston, this kit is engineered for OEM fitment and durability while delivering Factory Works-level performance. With nickel-carbide coating and precision porting, it provides reliability and power for riders who demand the best from their 450.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha YZ450F (2018-2019)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStock bore 97mm (450cc) - 12.8:1 compression ratio\u003c\/li\u003e\n\u003cli\u003eAluminum cylinder with nickel-carbide coating for durability\u003c\/li\u003e\n\u003cli\u003ePorted to Factory Works specifications for optimized performance\u003c\/li\u003e\n\u003cli\u003eForged piston kit for strength under extreme racing conditions\u003c\/li\u003e\n\u003cli\u003eComplete top end gasket set included\u003c\/li\u003e\n\u003cli\u003eDirect OEM replacement - does not include cylinder head\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena 97mm Nikasil-Coated Cylinder (Stock Bore - 450cc)\u003c\/li\u003e\n\u003cli\u003eAthena Forged OEM-Style Domed Piston Kit (piston, rings, wrist pin, circlips)\u003c\/li\u003e\n\u003cli\u003eAthena Top End Gasket Set (all required seals and hardware)\u003c\/li\u003e\n\u003cli\u003eHigh-Performance Hard Anodized Power Valves (not compatible with OEM valves)\u003c\/li\u003e\n\u003cli\u003eAll parts brand new in original packaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46777895715041,"sku":"0931-0959","price":772.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/yamaha-yz450f-athena-stock-bore-cylinder-kit-20182019-8986631.jpg?v=1764018665"},{"product_id":"kawasaki-kx450f-athena-stock-bore-cylinder-kit-2016-2018","title":"Kawasaki KX450F Athena Stock Bore Cylinder Kit (2016-2018)","description":"\u003cp\u003eBring your Kawasaki KX450F back to peak performance with this Athena Stock Bore Cylinder Kit. Featuring a precision-engineered 96mm cylinder, forged piston, and top end gasket set, this kit is built to OEM standards with Factory Works porting for superior airflow and race-ready reliability. Perfect for a full top-end refresh or preventative maintenance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eKawasaki KX450F (2016-2018)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStock bore 96mm (450cc) - 12.3:1 compression ratio\u003c\/li\u003e\n\u003cli\u003eAluminum cylinder with nickel-carbide coating for extreme durability\u003c\/li\u003e\n\u003cli\u003ePorted to Factory Works specs for added horsepower\u003c\/li\u003e\n\u003cli\u003eForged piston kit for superior performance and strength\u003c\/li\u003e\n\u003cli\u003eIncludes Athena top end gasket set\u003c\/li\u003e\n\u003cli\u003eDirect OEM replacement - cylinder head not included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena 96mm Nikasil-Coated Cylinder (Stock Bore - 450cc)\u003c\/li\u003e\n\u003cli\u003eAthena Forged OEM-Style Domed Piston Kit (piston, rings, wrist pin, circlips)\u003c\/li\u003e\n\u003cli\u003eAthena Top End Gasket Set (all required seals and hardware)\u003c\/li\u003e\n\u003cli\u003eHigh-Performance Hard Anodized Power Valves (not compatible with OEM valves)\u003c\/li\u003e\n\u003cli\u003eAll parts brand new, sealed in manufacturer packaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46777901056225,"sku":"0931-0961","price":772.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/kawasaki-kx450f-athena-stock-bore-cylinder-kit-20162018-8198772.png?v=1763567281"},{"product_id":"athena-connecting-rod-kit-ktm-husqvarna-gasgas-250f-2016-2023","title":"Athena Connecting Rod Kit - KTM Husqvarna GasGas 250F (2016-2023)","description":"\u003cp\u003eKeep your 250F engine running at peak performance with the Athena Connecting Rod Kit. Manufactured in Japan using high-quality materials and advanced treatments, this rod is designed to match OEM durability and performance while reducing stress under extreme riding conditions. Perfect for motocross, enduro, or street use.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eKTM\u003c\/li\u003e\n\u003cli\u003e250 SX-F (2016-2022)\u003c\/li\u003e\n\u003cli\u003e250 XC-F (2019-2022)\u003c\/li\u003e\n\u003cli\u003e250 EXC-F (2017-2022)\u003c\/li\u003e\n\u003cli\u003e250 EXC (2023)\u003c\/li\u003e\n\u003cli\u003eHusqvarna\u003c\/li\u003e\n\u003cli\u003eFC 250 (2016-2022)\u003c\/li\u003e\n\u003cli\u003eFE 250 (2017-2022)\u003c\/li\u003e\n\u003cli\u003eFE 250 (2022)\u003c\/li\u003e\n\u003cli\u003eGasGas\u003c\/li\u003e\n\u003cli\u003eMC 250F (2021-2023)\u003c\/li\u003e\n\u003cli\u003eEC 250F (2021-2023)\u003c\/li\u003e\n\u003cli\u003eEX 250F (2021-2023)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOEM-grade connecting rod made in Japan\u003c\/li\u003e\n\u003cli\u003eLightweight construction with OEM-spec materials\u003c\/li\u003e\n\u003cli\u003eHigh-frequency treatment for extreme durability\u003c\/li\u003e\n\u003cli\u003eReduces rotational \u0026amp; alternating stress loads\u003c\/li\u003e\n\u003cli\u003eDirect replacement for worn or damaged OEM rods\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eConnecting rod\u003c\/li\u003e\n\u003cli\u003eNeedle bearings\u003c\/li\u003e\n\u003cli\u003eCrankpin\u003c\/li\u003e\n\u003cli\u003eSmall end pins \u0026amp; shims (where required)\u003c\/li\u003e\n\u003cli\u003eAll components precision-made in Japan\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Specs:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDisplacement: 250cc\u003c\/li\u003e\n\u003cli\u003eStyle: 4-Stroke Off-Road \/ Street\u003c\/li\u003e\n\u003cli\u003eWeight: 1.16 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46778097467617,"sku":"0923-0576","price":242.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-connecting-rod-kit-ktm-husqvarna-gasgas-250f-20162023-8793447.jpg?v=1763567553"},{"product_id":"athena-68mm-big-bore-race-cylinder-kit-yamaha-banshee-350","title":"Athena 68mm Big Bore Race Cylinder Kit - Yamaha Banshee 350 (1987-2012)","description":"\u003cp\u003eTake your Banshee to the next level with the Athena 68mm Big Bore Race Cylinder Kit. This complete package increases displacement to 392cc and is engineered for serious riders who demand maximum performance from their two-stroke machine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1987-2006 Yamaha YFZ350 BansheeFits all standard and special edition Banshee 350 models.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDisplacement boost to 392cc with 68.00 mm bore\u003c\/li\u003e\n\u003cli\u003eLightweight aluminum cylinders with nickel-carbide coating\u003c\/li\u003e\n\u003cli\u003eCNC-machined cylinder heads with removable bronze domes\u003c\/li\u003e\n\u003cli\u003eSpecially designed Athena race power valves\u003c\/li\u003e\n\u003cli\u003eIncludes complete piston kits and top-end gaskets\u003c\/li\u003e\n\u003cli\u003eDesigned for high-performance two-stroke ATV applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e(2) Aluminum cylinders with nickel-carbide coating\u003c\/li\u003e\n\u003cli\u003e(2) Aluminum cylinder heads with removable bronze domes\u003c\/li\u003e\n\u003cli\u003eHigh-performance, hard anodized Athena power valves (OEM valves not compatible)\u003c\/li\u003e\n\u003cli\u003e(2) Cast lite flat-top pistons with rings, clips, and pins\u003c\/li\u003e\n\u003cli\u003eComplete Athena top-end gasket set with seals and hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":46836832829665,"sku":"Fixed-0931-0249","price":999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-68mm-big-bore-race-cylinder-kit-yamaha-banshee-350-3257208.jpg?v=1763567613"},{"product_id":"athena-piston-kit-with-gaskets-honda-crf450r-crf450rx-2021-2025-95-95-mm","title":"Athena Piston Kit with Gaskets - Honda CRF450R \/ CRF450RX (2021-2025, 95.95 mm)","description":"\u003cp\u003eUpgrade your CRF450's top end with the Athena Piston Kit with Gaskets, engineered for reliability and performance. Built from a high-silicon aluminum alloy, this kit ensures OEM-level dependability while offering improved resistance, smoother combustion, and long-lasting durability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHonda CRF450R: 2021-2025\u003c\/li\u003e\n\u003cli\u003eHonda CRF450RX: 2021-2025\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e13.5:1 compression ratio for stronger, more efficient power\u003c\/li\u003e\n\u003cli\u003eReverse-extruded piston design with CNC machining for precision fit\u003c\/li\u003e\n\u003cli\u003eReduced friction piston rings for higher performance and longer life\u003c\/li\u003e\n\u003cli\u003eSmooth piston profile ensures consistent flame propagation and efficient combustion\u003c\/li\u003e\n\u003cli\u003eBuilt from high-performance alloy with high silicon content for maximum strength and heat resistance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eForged 95.95 mm aluminum alloy piston\u003c\/li\u003e\n\u003cli\u003ePiston rings with Japanese PVD or chromium nitride wear-resistant coatings\u003c\/li\u003e\n\u003cli\u003eWrist pin \u0026amp; clips\u003c\/li\u003e\n\u003cli\u003eAthena top-end gasket set\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":47185238655201,"sku":"0903-1744","price":233.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-piston-kit-with-gaskets-honda-crf450r-crf450rx-20212025-9595-mm-4909462.jpg?v=1763567980"},{"product_id":"athena-complete-gasket-kit-honda-crf450r-crf450rx-crf450x-2021-2025","title":"Athena Complete Gasket Kit - Honda CRF450R \/ CRF450RX \/ CRF450X (2021-2025)","description":"\u003cp\u003eEnsure a perfect seal and long-lasting engine performance with the Athena Complete Gasket Kit. Designed for Honda CRF450 models, this kit includes everything you need for a professional top-to-bottom rebuild, manufactured with premium materials to handle extreme heat and pressure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHonda CRF450R: 2021-2025\u003c\/li\u003e\n\u003cli\u003eHonda CRF450RX: 2021-2025\u003c\/li\u003e\n\u003cli\u003eHonda CRF450X: 2021-2025\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSteel core gaskets with superior tensile strength and spring-back\u003c\/li\u003e\n\u003cli\u003eTransparent coating ensures a perfect seal even at extreme temps\u003c\/li\u003e\n\u003cli\u003eHigh-temp silicone beading prevents leaks in the most critical areas\u003c\/li\u003e\n\u003cli\u003eIncludes every gasket and seal required for a full rebuild\u003c\/li\u003e\n\u003cli\u003ePrecision manufactured to OEM standards for durability and reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHead gasket (rubber-coated spring steel construction)\u003c\/li\u003e\n\u003cli\u003eBase gaskets (rubber-coated soft steel)\u003c\/li\u003e\n\u003cli\u003eComplete set of critical flat gaskets with high-temp blue silicone beading\u003c\/li\u003e\n\u003cli\u003eValve stem seals\u003c\/li\u003e\n\u003cli\u003eAll necessary top-quality gaskets, seals, and rubber parts for a full engine rebuild\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":47185298292961,"sku":"0934-7472","price":201.56,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-complete-gasket-kit-honda-crf450r-crf450rx-crf450x-20212025-8988115.jpg?v=1763566792"},{"product_id":"athena-64mm-stock-bore-cylinders-yamaha-banshee-350-pair","title":"Athena 64mm Stock Bore Cylinders - Yamaha Banshee 350 (Pair) (1987-2012)","description":"\u003cp\u003eRefresh your Banshee with direct-replacement Athena 64 mm Nikasil cylinders. Designed with larger water jackets to help the engine run cooler and triple exhaust ports for a wide, exciting powerband, these stock-bore cylinders deliver durability, reliability, and bolt-on performance. Cylinders only (pair) - use with 64 mm pistons.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha Banshee 350 (All years 1987-2012)\u003c\/li\u003e\n\u003cli\u003eDirect replacement for stock bore (64 mm) applications\u003c\/li\u003e\n\u003cli\u003eMust be used with 64 mm pistons (not included)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNikasil plated for low friction and long service life\u003c\/li\u003e\n\u003cli\u003eLarger water jackets to improve cooling performance\u003c\/li\u003e\n\u003cli\u003eTriple exhaust ports for a broad, responsive powerband\u003c\/li\u003e\n\u003cli\u003eDirect OEM replacement dimensions for straightforward install\u003c\/li\u003e\n\u003cli\u003eCast-in AZ Quad Parts port specs\u003c\/li\u003e\n\u003cli\u003ePrecision bores for 64 mm (stock) pistons\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e(2) Athena 64 mm Nikasil-plated cylinders (left + right)\u003c\/li\u003e\n\u003cli\u003eOEM-style casting with AZ Quad Parts port spec cast-in details\u003c\/li\u003e\n\u003cli\u003ePre-finished bores ready for 64 mm pistons\u003c\/li\u003e\n\u003cli\u003eTransfer\/exhaust port architecture with triple exhaust ports\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"AZ","offers":[{"title":"Default Title","offer_id":47231807717601,"sku":null,"price":420.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/yamaha-banshee-350-complete-engine-rebuild-kit-oem-64-mm-2742197.webp?v=1763566620"},{"product_id":"athena-cylinder-kit-44-5mm-kx65-2002-2024","title":"Athena Cylinder Kit 44.5mm - KX65 (2002-2024)","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2002-2024 Kawasaki KX65\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e44.5 mm Nikasil-plated cylinder (OEM replacement)\u003c\/li\u003e\n\u003cli\u003eHigh-compression piston (14.2:1)\u003c\/li\u003e\n\u003cli\u003ePiston rings, wrist pin, and circlips\u003c\/li\u003e\n\u003cli\u003eComplete top-end gasket kit\u003c\/li\u003e\n\u003cli\u003eRequired O-rings and seals\u003c\/li\u003e\n\u003cli\u003eOEM-style cylinder with precision Nikasil plating for durability and heat dissipation\u003c\/li\u003e\n\u003cli\u003eForged high-compression piston for increased torque and throttle response\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCylinder and piston kit as specified\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS","offers":[{"title":"Default Title","offer_id":47248145350881,"sku":"68-4889","price":683.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-cylinder-kit-445mm-kx65-20022024-8775269.jpg?v=1763566896"},{"product_id":"athena-cylinder-44-5-mm-kx65-2002-2024","title":"Athena Cylinder 44.5 mm - KX65 (2002-2024)","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2002-2024 Kawasaki KX65\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e44.5 mm Nikasil-plated aluminum cylinder (OEM replacement)\u003c\/li\u003e\n\u003cli\u003eFactory-spec porting for consistent power delivery\u003c\/li\u003e\n\u003cli\u003eWider water-jacket design for improved cooling\u003c\/li\u003e\n\u003cli\u003eCompatible with OEM or Athena piston and gasket kits\u003c\/li\u003e\n\u003cli\u003eOEM replacement 44.5 mm standard-bore cylinder\u003c\/li\u003e\n\u003cli\u003eNickel Carbide (Nikasil) coating for extended wear resistance\u003c\/li\u003e\n\u003cli\u003eFactory-style porting for balanced torque and top-end power\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAs specified in product title\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS","offers":[{"title":"Default Title","offer_id":47248148955361,"sku":"68-4882","price":375.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-cylinder-445-mm-kx65-20022024-7550289.jpg?v=1767316025"},{"product_id":"athena-valve-cover-gasket-kx250f-rm-z250-2004-2008","title":"Athena Valve Cover Gasket - KX250F \/ RM-Z250 (2004-2008)","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2004-2008 Kawasaki \/ Suzuki KX250F\u003c\/li\u003e\n\u003cli\u003e2004-2008 Kawasaki \/ Suzuki RM-Z250\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e(1) Athena valve cover gasket (KX250F \/ RM-Z250)\u003c\/li\u003e\n\u003cli\u003eOEM-style fit for fast, clean installs\u003c\/li\u003e\n\u003cli\u003eDurable materials for heat, oil, and pressure resistance\u003c\/li\u003e\n\u003cli\u003eIdeal for top-end services or routine gasket refreshes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComplete gasket set as specified\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS","offers":[{"title":"Default Title","offer_id":47250785468641,"sku":"67-0456V","price":31.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-valve-cover-gasket-kx250f-rm-z250-20042008-9046104.jpg?v=1763567552"},{"product_id":"athena-forged-piston-kit-46-96-mm-gasgas-mc85-ktm-85-sx-husqvarna-tc85","title":"Athena Forged Piston Kit 46.96 mm GasGas MC85 KTM 85 SX Husqvarna TC85 (2003-2025)","description":"\u003cp\u003eBoost the performance and reliability of your 85cc two-stroke with the Athena Forged Race Piston Kit, precision-engineered for durability and efficiency under extreme conditions. Designed for OEM cylinders, this piston delivers smoother operation, less friction, and more consistent power - tested on both dyno benches and the track.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGasGas MC85 (2021-2024)\u003c\/li\u003e\n\u003cli\u003eHusqvarna TC85 (2014-2025)\u003c\/li\u003e\n\u003cli\u003eKTM 85 SX (2003-2016, 2018-2021)\u003c\/li\u003e\n\u003cli\u003eKTM 85 XC (2008-2012)\u003c\/li\u003e\n\u003cli\u003eFor use with OE cylinder applications.Compatible with both 17\/14 and 19\/16 wheel configurations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eForged 4032 aluminum alloy for maximum strength and reduced expansion\u003c\/li\u003e\n\u003cli\u003eHigh resistance to mechanical and thermal stress\u003c\/li\u003e\n\u003cli\u003eDyno- and race-tested under progressive stress loads for reliability in extreme riding conditions\u003c\/li\u003e\n\u003cli\u003eLow-friction rings reduce drag and improve engine efficiency\u003c\/li\u003e\n\u003cli\u003eDomed piston head maintains stock compression and optimized combustion efficiency\u003c\/li\u003e\n\u003cli\u003eDesigned for OEM cylinder compatibility and race performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eForged 46.96 mm Athena piston (Type A)\u003c\/li\u003e\n\u003cli\u003ePiston rings (low-friction design)\u003c\/li\u003e\n\u003cli\u003eWrist pin\u003c\/li\u003e\n\u003cli\u003eCirclips\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":47255251550433,"sku":"0910-2533","price":142.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-forged-piston-kit-4696-mm-gasgas-mc85-ktm-85-sx-husqvarna-tc85-2641677.jpg?v=1763567445"},{"product_id":"athena-complete-gasket-kit-honda-trx250r-1986-1989","title":"Athena Complete Gasket Kit - Honda TRX250R 1986-1989","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1986-1989 Honda TRX250R\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAll O-rings, seals, and gaskets needed for assembly\u003c\/li\u003e\n\u003cli\u003eMeets or exceeds OEM specs\u003c\/li\u003e\n\u003cli\u003eMade from premium materials using computer-controlled manufacturing\u003c\/li\u003e\n\u003cli\u003eDesigned for long-lasting, leak-free performance\u003c\/li\u003e\n\u003cli\u003eEasy install - no trimming required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComplete engine gasket set (top and bottom end)\u003c\/li\u003e\n\u003cli\u003eWhat’s Included Complete engine gasket set (top and bottom end) All O-rings, seals, and gaskets need\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS","offers":[{"title":"Default Title","offer_id":47259501920481,"sku":"68-0820","price":65.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-complete-gasket-kit-honda-trx250r-19861989-2060868.jpg?v=1763567445"},{"product_id":"athena-top-end-gasket-kit-honda-trx250r-1986-1989","title":"Athena Top End Gasket Kit - Honda TRX250R 1986-1989","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1986-1989 Honda TRX250R\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncludes all gaskets and O-rings from the base gasket up\u003c\/li\u003e\n\u003cli\u003ePrecision-made in computer-controlled facilities\u003c\/li\u003e\n\u003cli\u003eMeets or exceeds OEM specifications\u003c\/li\u003e\n\u003cli\u003eBuilt from premium materials for durability and performance\u003c\/li\u003e\n\u003cli\u003ePerfect for 2-stroke rebuilds or maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComplete top end gasket set\u003c\/li\u003e\n\u003cli\u003eWhat’s Included Complete top end gasket set Includes all gaskets and O-rings from the base gasket up\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS","offers":[{"title":"Default Title","offer_id":47259508113633,"sku":"69-0820","price":44.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-top-end-gasket-kit-honda-trx250r-19861989-3377592.jpg?v=1763566980"},{"product_id":"honda-crf250r-crf250rx-athena-85-mm-big-bore-cylinder-kit-13-7-1","title":"Athena 85mm Big Bore Cylinder Kit - 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rings, pin \u0026amp; circlips included\u003c\/li\u003e\n\u003cli\u003eComplete Top-End Gasket Set for precise sealing and easy installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS","offers":[{"title":"Default Title","offer_id":47281469030625,"sku":"68-4718","price":1007.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/honda-crf250r-crf250rx-athena-85-mm-big-bore-cylinder-kit-137-1-2110789.jpg?v=1763566630"},{"product_id":"athena-p400485100077-53-mm-cylinder-kit-yamaha-yz85-2019-2024","title":"Athena P400485100077 53 mm Cylinder Kit - Yamaha YZ85 2019-2026","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2019-2026 Yamaha YZ85\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena 53 mm Cylinder Kit (P400485100077)\u003c\/li\u003e\n\u003cli\u003eInstallation-ready, direct bolt-on design\u003c\/li\u003e\n\u003cli\u003eNo additional hardware included (uses existing hardware)\u003c\/li\u003e\n\u003cli\u003eReady-to-install, direct bolt-on cylinder; no re-plating required\u003c\/li\u003e\n\u003cli\u003ePrecision-engineered for longevity and performance\u003c\/li\u003e\n\u003cli\u003eCompatible with 53 mm bore (specific displacement not listed, typical for YZ85 ~85 cc)\u003c\/li\u003e\n\u003cli\u003e4-cycle engine\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCylinder as specified - piston kit sold separately unless noted\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS","offers":[{"title":"Default Title","offer_id":47317058355425,"sku":"68-4959","price":983.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-p400485100077-53-mm-cylinder-kit-yamaha-yz85-2019-2026-2401245.jpg?v=1763566463"},{"product_id":"athena-p400485100038-53-mm-big-bore-race-kit-yamaha-yz85-2002-2018","title":"Athena P400485100038 53 mm Big Bore Race Kit - Yamaha YZ85 2002-2018","description":"\u003cp\u003eUnleash the potential of your Yamaha YZ85 with the Athena P400485100038 53 mm Big Bore Race Cylinder Kit, designed for 2002-2018 models. This 2-stroke kit boosts displacement to 105 cc with a high-performance aluminum cylinder and piston, ideal for off-road racing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha:\u003c\/li\u003e\n\u003cli\u003e2002-2018 YZ85\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAluminum cylinder with nickel-carbide coating for durability and heat resistance\u003c\/li\u003e\n\u003cli\u003eIncreases displacement to 105 cc with 53.00 mm bore\u003c\/li\u003e\n\u003cli\u003eSpecially designed power valves for enhanced performance (replaces OEM valves)\u003c\/li\u003e\n\u003cli\u003eForged race piston for superior strength and reduced weight\u003c\/li\u003e\n\u003cli\u003eMade in the U.S.A. with precision engineering\u003c\/li\u003e\n\u003cli\u003e2-stroke engine compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena Big Bore Race Cylinder (P400485100038)\u003c\/li\u003e\n\u003cli\u003eAluminum cylinder head with removable bronze dome\u003c\/li\u003e\n\u003cli\u003eHigh-performance, hard-anodized power valves (non-OEM compatible)\u003c\/li\u003e\n\u003cli\u003eForged race piston kit (piston, rings, clips, pin)\u003c\/li\u003e\n\u003cli\u003eAthena top-end gasket set with required seals and hardware\u003c\/li\u003e\n\u003cli\u003eInstallation-ready design (crankcase modifications required)\u003c\/li\u003e\n\u003cli\u003eNo additional hardware included beyond kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Specs:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e6.33\" (H) × 13.07\" (L) × 8.26\" (W)\u003c\/li\u003e\n\u003cli\u003eAvailability: In stock. Ships next business day\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Crankcase modifications are required for installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Always verify fitment by year, make, model, and engine specifications before ordering. Crankcase modifications are necessary; consult a professional mechanic or Athena instructions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Crankcase modifications required; seek professional assistance or follow Athena guidelines.\u003c\/p\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":47317060026593,"sku":"0931-0473","price":843.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-p400485100038-53-mm-big-bore-race-kit-yamaha-yz85-2002-2018-1328817.jpg?v=1763567085"},{"product_id":"athena-p400485100093-47-5-mm-cylinder-kit-yamaha-yz85-2002-2018","title":"Athena P400485100093 47.5 mm Cylinder Kit - Yamaha YZ85 2002-2018","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2002-2018 Yamaha YZ85\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena Cylinder Kit (P400485100093)\u003c\/li\u003e\n\u003cli\u003e47.5 mm cylinder\u003c\/li\u003e\n\u003cli\u003eInstallation-ready design\u003c\/li\u003e\n\u003cli\u003eNo additional hardware included (uses existing components)\u003c\/li\u003e\n\u003cli\u003eHigh-quality cylinder kit for improved engine performance\u003c\/li\u003e\n\u003cli\u003e47.5 mm bore size for increased displacement\u003c\/li\u003e\n\u003cli\u003e2-stroke engine compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCylinder as specified - piston kit sold separately unless noted\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS","offers":[{"title":"Default Title","offer_id":47317150925025,"sku":"68-4941","price":566.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-p400485100093-475-mm-cylinder-kit-yamaha-yz85-2002-2018-1794852.jpg?v=1763566461"},{"product_id":"athena-p400485100076-47-5-mm-cylinder-kit-yamaha-yz85-2019-2024","title":"Athena P400485100076 47.5 mm Cylinder Kit - Yamaha YZ85 2019-2024","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2019-2024 Yamaha YZ85\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena Cylinder Kit (P400485100076)\u003c\/li\u003e\n\u003cli\u003e47.5 mm cylinder\u003c\/li\u003e\n\u003cli\u003eInstallation-ready design\u003c\/li\u003e\n\u003cli\u003eNo additional hardware included (uses existing components)\u003c\/li\u003e\n\u003cli\u003eHigh-quality cylinder kit for enhanced engine performance\u003c\/li\u003e\n\u003cli\u003e47.5 mm bore size for increased displacement\u003c\/li\u003e\n\u003cli\u003e2-stroke engine compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCylinder as specified - piston kit sold separately unless noted\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS","offers":[{"title":"Default Title","offer_id":47317173240033,"sku":"68-4951","price":881.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-p400485100076-475-mm-cylinder-kit-yamaha-yz85-2019-2024-4852956.png?v=1763569998"},{"product_id":"athena-s410485301076-47-5-mm-cylinder-only-yamaha-yz85-2019-2024","title":"Athena S410485301076 47.5 mm Cylinder Only - Yamaha YZ85 2019-2024","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2019-2024 Yamaha YZ85\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena Cylinder Only (S410485301076)\u003c\/li\u003e\n\u003cli\u003e47.5 mm nickel carbide coated cylinder\u003c\/li\u003e\n\u003cli\u003eInstallation-ready design\u003c\/li\u003e\n\u003cli\u003eNo additional hardware or components included (uses existing piston and gaskets)\u003c\/li\u003e\n\u003cli\u003eAvailable in standard bore (47.5 mm) and big bore sizes\u003c\/li\u003e\n\u003cli\u003eNickel carbide coated cylinder with factory-spec porting for improved durability\u003c\/li\u003e\n\u003cli\u003eSpecial hard anodized exhaust valves for enhanced performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNote: Does not include piston kit or gasket set (available in full cylinder kits)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS","offers":[{"title":"Default Title","offer_id":47317177336033,"sku":"68-4956","price":497.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-s410485301076-475-mm-cylinder-only-yamaha-yz85-2019-2024-6140750.png?v=1763566895"},{"product_id":"athena-complete-gasket-kit-cr500r-1989-2001","title":"Athena Complete Gasket Kit - CR500R 1989-2001","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1989-2001 Honda CR500R\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2001 CR500R\u003c\/li\u003e\n\u003cli\u003e2000 CR500R\u003c\/li\u003e\n\u003cli\u003e1999 CR500R\u003c\/li\u003e\n\u003cli\u003e1998 CR500R\u003c\/li\u003e\n\u003cli\u003e1997 CR500R\u003c\/li\u003e\n\u003cli\u003e1996 CR500R\u003c\/li\u003e\n\u003cli\u003e1995 CR500R\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComplete gasket set as specified\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS","offers":[{"title":"Default Title","offer_id":47351498277089,"sku":"68-0273","price":67.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-complete-gasket-kit-cr500r-19892001-9336268.jpg?v=1763566981"},{"product_id":"athena-top-end-gasket-kit-cr500r-1989-2001","title":"Athena Top End Gasket Kit - CR500R 1989-2001","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1989-2001 Honda CR500R\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2001 CR500R\u003c\/li\u003e\n\u003cli\u003e2000 CR500R\u003c\/li\u003e\n\u003cli\u003e1999 CR500R\u003c\/li\u003e\n\u003cli\u003e1998 CR500R\u003c\/li\u003e\n\u003cli\u003e1997 CR500R\u003c\/li\u003e\n\u003cli\u003e1996 CR500R\u003c\/li\u003e\n\u003cli\u003e1995 CR500R\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComplete top-end gasket set\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS","offers":[{"title":"Default Title","offer_id":47351505354977,"sku":"69-0273","price":44.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-top-end-gasket-kit-cr500r-19892001-8549141.jpg?v=1763567280"},{"product_id":"athena-yfz450-98-mm-big-bore-cylinder-kit-478-cc-2004-2009","title":"Athena YFZ450 98 mm Big Bore Cylinder Kit - 478 cc (2004-2009)","description":"\u003cp\u003eTake your YFZ450's performance to the next level with the Athena 98 mm Big Bore Race Cylinder Kit. Featuring race-engineered components and precision nickel-carbide coating, this kit delivers more displacement, stronger power throughout the RPM range, and unmatched durability for aggressive riding.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYamaha YFZ450 (2004-2009)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMore Power \u0026amp; Torque - Boosts displacement to 478 cc for instant low-end and midrange gains\u003c\/li\u003e\n\u003cli\u003eRace-Spec Cylinder - Nickel-carbide coating ensures reliability under high heat and RPM\u003c\/li\u003e\n\u003cli\u003ePrecision Water Jackets - Improved cooling capacity for sustained hard riding\u003c\/li\u003e\n\u003cli\u003eForged Piston Design - Lightweight yet strong for maximized throttle response\u003c\/li\u003e\n\u003cli\u003eEasy Bolt-On Upgrade - No machining required; fits directly to OEM bottom end\u003c\/li\u003e\n\u003cli\u003eCompression Ratio 12.0-12.4 : 1 - Optimized for pump or race fuel\u003c\/li\u003e\n\u003cli\u003e(Cylinder head not included.)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e98 mm (478 cc) Big Bore Aluminum Cylinder\u003c\/li\u003e\n\u003cli\u003eNickel-Carbide Cylinder Bore Coating\u003c\/li\u003e\n\u003cli\u003eForged Molybdenum-Coated Piston\u003c\/li\u003e\n\u003cli\u003ePiston Rings\u003c\/li\u003e\n\u003cli\u003eWrist Pin \u0026amp; Circlips\u003c\/li\u003e\n\u003cli\u003eHigh-Performance Power Valves (hard anodized)\u003c\/li\u003e\n\u003cli\u003eInstallation Instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":47388754903265,"sku":"0931-0022","price":820.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-yfz450-98-mm-big-bore-cylinder-kit-478-cc-20042009-7540881.png?v=1764105066"},{"product_id":"athena-94-mm-big-bore-kit-dr-z400-kfx400-dvx400-2003-2017","title":"Athena 94 mm Big Bore Kit DR-Z400 \/ KFX400 \/ DVX400 (2003-2017)","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2003-2017 Suzuki \/ Kawasaki \/ Arctic Cat DR-Z400\u003c\/li\u003e\n\u003cli\u003e2003-2017 Suzuki \/ Kawasaki \/ Arctic Cat KFX400\u003c\/li\u003e\n\u003cli\u003e2003-2017 Suzuki \/ Kawasaki \/ Arctic Cat DVX400\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e94 mm Big Bore Cylinder (12.3 : 1 compression)\u003c\/li\u003e\n\u003cli\u003eReady to install - no case machining required\u003c\/li\u003e\n\u003cli\u003eIncreases displacement and compression for stronger power delivery\u003c\/li\u003e\n\u003cli\u003eNickel-silicon-carbide plating for extended service life\u003c\/li\u003e\n\u003cli\u003eForged piston matched to the cylinder for quiet, efficient operation\u003c\/li\u003e\n\u003cli\u003eFactory-style fit and appearance\u003c\/li\u003e\n\u003cli\u003eMade in Italy by Athena\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eForged Piston Kit (piston, rings, pin \u0026amp; circlips)\u003c\/li\u003e\n\u003cli\u003eTop-End Gasket Set\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS","offers":[{"title":"Default Title","offer_id":47408006398177,"sku":"68-4410","price":965.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-94-mm-big-bore-kit-dr-z400-kfx400-dvx400-2003-2017-1991321.jpg?v=1763566293"},{"product_id":"athena-complete-gasket-kit-lt-z400-kfx400-2003-2014","title":"Athena Complete Gasket Kit LT-Z400 \/ KFX400 (2003-2014)","description":"\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2003-2014 Suzuki \/ Kawasaki LT-Z400\u003c\/li\u003e\n\u003cli\u003e2003-2014 Suzuki \/ Kawasaki KFX400\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAll O-rings and seals for full engine rebuild\u003c\/li\u003e\n\u003cli\u003eMade from premium materials for oil, coolant, and pressure resistance\u003c\/li\u003e\n\u003cli\u003eMeets or exceeds OEM specifications\u003c\/li\u003e\n\u003cli\u003eEngineered for superior durability and heat resistance\u003c\/li\u003e\n\u003cli\u003eIncludes all necessary gaskets, O-rings, and seals\u003c\/li\u003e\n\u003cli\u003eDesigned and manufactured in Italy by Athena\u003c\/li\u003e\n\u003cli\u003eIdeal companion for Athena or Cylinder Works big bore and rebuild kits\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComplete top and bottom-end gasket set\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"WPS","offers":[{"title":"Default Title","offer_id":47408008134881,"sku":"68-0903","price":221.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-complete-gasket-kit-lt-z400-kfx400-20032014-6768722.jpg?v=1763566226"},{"product_id":"athena-big-bore-race-cylinder-kit-kawasaki-kx65-2002-2025","title":"Athena Big Bore Race Cylinder Kit - Kawasaki KX65 (2002-2025)","description":"\u003cp\u003eUpgrade your Kawasaki KX65 (2002-2025) to true race performance with the Athena 80cc Big Bore Race Cylinder Kit (P400250100007). Designed for riders looking for more power, torque, and throttle response, this kit transforms your 65cc mini into a championship-level machine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2002-2025 Kawasaki KX65\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncreases displacement from 65cc to approximately 80cc\u003c\/li\u003e\n\u003cli\u003eNickel-carbide bore coating for reduced friction and long life\u003c\/li\u003e\n\u003cli\u003eRace-engineered power valve system (not OEM compatible)\u003c\/li\u003e\n\u003cli\u003eIncludes all necessary gaskets, seals, and piston kit\u003c\/li\u003e\n\u003cli\u003ePrecision-machined aluminum head with bronze dome for optimal combustion\u003c\/li\u003e\n\u003cli\u003eDesigned for racing and high-performance builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena Big Bore Race Cylinder Kit - Kawasaki KX65\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":47413020721377,"sku":"0931-0107","price":806.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-big-bore-race-cylinder-kit-kawasaki-kx65-20022025-9169064.jpg?v=1763566226"},{"product_id":"athena-80cc-big-bore-cylinder-kit-ktm-65-sx-xc-2001-2008","title":"Athena 80cc Big Bore Cylinder Kit - KTM 65 SX \/ XC (2001-2008)","description":"\u003cp\u003eTake your KTM 65 SX or 65 XC to the next level of race performance with the Athena 80cc Big Bore Race Cylinder Kit (P400270100002). Designed for serious mini racers, this kit boosts power, torque, and throttle response across the entire RPM range while maintaining reliable cooling and long-term durability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2001-2008 KTM 65 SX\u003c\/li\u003e\n\u003cli\u003e2002-2008 KTM 65 XC\u003c\/li\u003e\n\u003cli\u003e(Converts stock 65cc motor to approximately 80cc displacement. Compatible with OEM crankcase and bottom-end components.)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncreases displacement from 65cc to approximately 80cc\u003c\/li\u003e\n\u003cli\u003eRace-spec power valve and cylinder head system (non-OEM compatible)\u003c\/li\u003e\n\u003cli\u003eNickel-carbide coated bore for maximum reliability and heat transfer\u003c\/li\u003e\n\u003cli\u003eIncludes piston, gaskets, seals, and precision hardware\u003c\/li\u003e\n\u003cli\u003eDesigned for competition and high-performance builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAthena 80cc Big Bore Cylinder Kit - KTM 65 SX \/ XC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":47413698003169,"sku":"0931-0245","price":872.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-80cc-big-bore-cylinder-kit-ktm-65-sx-xc-20012008-7071821.jpg?v=1764018176"},{"product_id":"kawasaki-kfx450r-2008-2014-96mm-stock-bore-race-cylinder-kit-athena","title":"Kawasaki KFX450R (2008-2014) 96mm Stock Bore Race Cylinder Kit - Athena","description":"\u003cp\u003eFactory Works-level domination - the Athena P400250100009 96.00mm Stock Bore Race Cylinder Kit is a race-spec, drop-in upgrade for 2008-2014 Kawasaki KFX450R. Featuring a hard-anodized aluminum cylinder with nickel-carbide coating, ported to Factory Works specs, forged 13.2:1 domed piston, and high-flow power valves (non-OEM), this kit delivers explosive top-end power, superior heat rejection, and championship durability. Cylinder head not included.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2008-2014 Kawasaki KFX450R\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e96.00 mm stock bore - direct OEM fit, no boring\u003c\/li\u003e\n\u003cli\u003eNickel-carbide coating - extreme wear resistance, low friction\u003c\/li\u003e\n\u003cli\u003eFactory Works porting - max airflow, race-tuned performance\u003c\/li\u003e\n\u003cli\u003e13.2:1 forged piston - high-compression power gains\u003c\/li\u003e\n\u003cli\u003eHard-anodized power valves - faster response, longer life\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHard-Anodized Aluminum Cylinder (nickel-carbide coated, Factory Works porting)\u003c\/li\u003e\n\u003cli\u003eForged Domed Piston Kit (13.2:1 compression, rings, pin, clips)\u003c\/li\u003e\n\u003cli\u003eHigh-Performance Power Valves (hard-anodized, non-OEM)\u003c\/li\u003e\n\u003cli\u003eAthena Top-End Gasket Set (head, base, seals, hardware)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov\u003c\/p\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":47445584216289,"sku":"0931-0253","price":772.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/kawasaki-kfx450r-20082014-96mm-stock-bore-race-cylinder-kit-athena-9459340.png?v=1763565977"},{"product_id":"yamaha-yz450f-2014-2017-97mm-stock-bore-race-cylinder-kit-athena-p400485100053","title":"Yamaha YZ450F (2014-2017) 97mm Stock Bore Race Cylinder Kit - Athena P400485100053","description":"\u003cp\u003eYamaha YZ450F 2014-2017 97mm Stock Bore Factory Works Race Cylinder Kit - Athena Factory-level power, no machining - the Athena P400485100053 is a complete stock-bore race cylinder kit for 2014-2017 Yamaha YZ450F. 97mm nickel-carbide plated aluminum cylinder (Factory Works porting), forged 12.4:1 domed piston, hard-anodized power valves, and full top-end gasket set - drop-in +20 hp potential for MX\/supercross builds. Cylinder head not included.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Fits:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2014 Yamaha YZ450F\u003c\/li\u003e\n\u003cli\u003e2015 Yamaha YZ450F\u003c\/li\u003e\n\u003cli\u003e2016 Yamaha YZ450F\u003c\/li\u003e\n\u003cli\u003e2017 Yamaha YZ450F\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e97 mm stock bore - direct OEM replacement, no boring\u003c\/li\u003e\n\u003cli\u003eNickel-carbide plating - extreme durability, low friction\u003c\/li\u003e\n\u003cli\u003eFactory Works porting - max airflow, race-tuned performance\u003c\/li\u003e\n\u003cli\u003e12.4:1 forged piston - aggressive mid-top power\u003c\/li\u003e\n\u003cli\u003eHard-anodized power valves - faster response, longer life\u003c\/li\u003e\n\u003cli\u003eMade in Italy - pro-grade precision\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e✓ What's Included:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e97.00 mm Aluminum Cylinder - nickel-carbide coated, Factory Works porting\u003c\/li\u003e\n\u003cli\u003eForged Domed Piston Kit - 12.4:1 compression, rings, pin, clips\u003c\/li\u003e\n\u003cli\u003eHard-Anodized Power Valves - high-flow, non-OEM\u003c\/li\u003e\n\u003cli\u003eAthena Top-End Gasket Set - head\/base gaskets, seals, hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov\u003c\/p\u003e\n\u003cp\u003eShips fast from DuneGoonShop!\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":47472779559137,"sku":"0931-0958","price":772.8,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/yamaha-yz450f-20142017-97mm-stock-bore-race-cylinder-kit-athena-p400485100053-9471259.png?v=1763565982"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/collections\/download_ad1813bc-de19-4ffc-9689-01e816bdcc92.png?v=1768029782","url":"https:\/\/dunegoonshop.com\/en-ca\/collections\/athena.oembed?page=27","provider":"Dune Goons","version":"1.0","type":"link"}