{"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":"\u003ch1 dir=\"ltr\" data-pm-slice=\"1 3 []\"\u003eAthena P400485100038 53 mm Big Bore Race Cylinder Kit – Yamaha YZ85 2002-2018\u003c\/h1\u003e\n\u003cp dir=\"ltr\"\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. \u003cstrong\u003eWe price-match reputable online stores—contact us to ensure you get the best deal!\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2 dir=\"ltr\"\u003e✅ What’s Included\u003c\/h2\u003e\n\u003cul class=\"tight\" data-tight=\"true\" dir=\"ltr\"\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eAthena Big Bore Race Cylinder (P400485100038)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eAluminum cylinder head with removable bronze dome\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eHigh-performance, hard-anodized power valves (non-OEM compatible)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eForged race piston kit (piston, rings, clips, pin)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eAthena top-end gasket set with required seals and hardware\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eInstallation-ready design (crankcase modifications required)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eNo additional hardware included beyond kit\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 dir=\"ltr\"\u003e🔑 Key Features\u003c\/h2\u003e\n\u003cul class=\"tight\" data-tight=\"true\" dir=\"ltr\"\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eAluminum cylinder with nickel-carbide coating for durability and heat resistance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eIncreases displacement to 105 cc with 53.00 mm bore\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eSpecially designed power valves for enhanced performance (replaces OEM valves)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eForged race piston for superior strength and reduced weight\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eMade in the U.S.A. with precision engineering\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003e2-stroke engine compatibility\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWarning:\u003c\/strong\u003e Cancer and Reproductive Harm - www.P65Warnings.ca.gov\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Crankcase modifications are required for installation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 dir=\"ltr\"\u003e📦 Fitment (Highlights)\u003c\/h2\u003e\n\u003cul class=\"tight\" data-tight=\"true\" dir=\"ltr\"\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eYamaha:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"tight\" data-tight=\"true\" dir=\"ltr\"\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003e2002-2018 YZ85\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eNotes:\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\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 dir=\"ltr\"\u003e💲 Price \u0026amp; SKU\u003c\/h2\u003e\n\u003cul class=\"tight\" data-tight=\"true\" dir=\"ltr\"\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eRetail Price:\u003c\/strong\u003e $976.95\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e 0931-0473 \/ P400485100038\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e We price-match reputable online stores—contact us for the best price!\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eWeight:\u003c\/strong\u003e 4.33 lbs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eDimensions:\u003c\/strong\u003e 6.33\" (H) × 13.07\" (L) × 8.26\" (W)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003e\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock. Ships next business day\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 dir=\"ltr\"\u003e🛡️ Warranty\u003c\/h2\u003e\n\u003cul class=\"tight\" data-tight=\"true\" dir=\"ltr\"\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eContact Athena for warranty details (proof of purchase required)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 dir=\"ltr\"\u003e🔧 Installation Tips\u003c\/h2\u003e\n\u003cul class=\"tight\" data-tight=\"true\" dir=\"ltr\"\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eCrankcase modifications required; seek professional assistance or follow Athena guidelines.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eTorque cylinder head bolts to Yamaha specs (~15-20 ft-lbs, consult manual).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eAdjust jetting (e.g., Mikuni carb) for increased displacement—start with richer mains (e.g., 32-35 pilot, 115-120 main).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp dir=\"ltr\"\u003eVerify power valve clearance and timing after installation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Parts Unlimited","offers":[{"title":"Default Title","offer_id":47317060026593,"sku":"0931-0473","price":976.95,"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","url":"https:\/\/dunegoonshop.com\/products\/athena-p400485100038-53-mm-big-bore-race-kit-yamaha-yz85-2002-2018","provider":"Dune Goons","version":"1.0","type":"link"}