{"product_id":"athena-big-bore-cylinder-kit-144cc-kawasaki-kx125-2003-2007","title":"Athena Big Bore Cylinder Kit 144cc - Kawasaki KX125 (2003-2007)","description":"\u003cp\u003eRace-Ready 144cc Big Bore Kit for KX125\u003c\/p\u003e\n\u003cp\u003eAthena big bore cylinder kit transforms your KX125 into a 144cc powerhouse. Complete race-spec kit with aluminum cylinder, high-performance power valves, piston kit, and gaskets—everything for serious power gains.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eWhy Athena Big Bore Kits\u003c\/p\u003e\n\u003cp\u003e✓ 144cc displacement (from 125cc)\u003cbr\u003e✓ 58mm bore (oversized)\u003cbr\u003e✓ Aluminum cylinder – nickel carbide coating\u003cbr\u003e✓ High-performance power valves included\u003cbr\u003e✓ Complete kit – cylinder, piston, gaskets\u003cbr\u003e✓ Race-proven performance\u003cbr\u003e✓ Professional-grade quality\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eWhat's Included\u003c\/p\u003e\n\u003cp\u003e✓ Aluminum cylinder (58mm bore)\u003cbr\u003e✓ Aluminum cylinder head (removable bronze dome)\u003cbr\u003e✓ High-performance anodized power valves\u003cbr\u003e✓ Cast lite flat-top piston\u003cbr\u003e✓ Rings, clips, wrist pin\u003cbr\u003e✓ Complete Athena top end gasket set\u003cbr\u003e✓ All required seals and hardware\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eDoes It Fit?\u003c\/p\u003e\n\u003cp\u003e✅ **Kawasaki KX125** (2003-2007)\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eQuick Specs\u003c\/p\u003e\n\u003cp\u003ePart #: P400250100011 \/ 0931-0109\u003cbr\u003eBore Size: 58.00mm\u003cbr\u003eDisplacement: 144cc (from 125cc)\u003cbr\u003eCylinder: Aluminum with nickel-carbide coating\u003cbr\u003eHead: Aluminum with removable bronze dome\u003cbr\u003ePiston: Cast lite flat-top\u003cbr\u003eEngine Type: 2-stroke\u003cbr\u003eWeight: 5.62 lbs\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003ePremium Cylinder Construction\u003c\/p\u003e\n\u003cp\u003e**Nickel-Carbide Coating:**\u003cbr\u003eAdvanced cylinder coating for superior wear resistance and heat dissipation\u003c\/p\u003e\n\u003cp\u003e**Aluminum Cylinder:**\u003cbr\u003eLightweight performance construction\u003c\/p\u003e\n\u003cp\u003e**Bronze Dome Head:**\u003cbr\u003eRemovable dome allows compression tuning\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eHigh-Performance Power Valves\u003c\/p\u003e\n\u003cp\u003e**Specially Designed:**\u003cbr\u003eHard anodized power valves engineered for big bore performance\u003c\/p\u003e\n\u003cp\u003e⚠️ **Important:** Cannot use OEM power valves—must use included Athena valves\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eRace-Ready Power Gains\u003c\/p\u003e\n\u003cp\u003e**144cc vs. 125cc:**\u003cbr\u003e19cc displacement increase delivers substantial power and torque gains throughout the powerband\u003c\/p\u003e\n\u003cp\u003e**More Displacement = More Power:**\u003cbr\u003eBigger bore means more fuel\/air mixture per cycle\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eComplete Top End Kit\u003c\/p\u003e\n\u003cp\u003e**Everything Included:**\u003cbr\u003e- Cylinder and head\u003cbr\u003e- Power valves\u003cbr\u003e- Piston kit (piston, rings, pin, clips)\u003cbr\u003e- Complete gasket set\u003cbr\u003e- All seals\u003cbr\u003e- All hard\u003c\/p\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":47600921280737,"sku":"0931-0109","price":1201.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1219\/2993\/files\/athena-big-bore-cylinder-kit-144cc-kawasaki-kx125-2003-2007-2720031.png?v=1764883986","url":"https:\/\/dunegoonshop.com\/products\/athena-big-bore-cylinder-kit-144cc-kawasaki-kx125-2003-2007","provider":"Dune Goons","version":"1.0","type":"link"}