{"product_id":"808m06640-wiseco-single-ring-gp-series-std-piston-for-yamaha-yz250-1999-2024-66","title":"808M06640 Wiseco Single Ring GP Series Std Piston for Yamaha YZ250 1999-2024 66.","description":"\u003ch2\u003ePiston for Yamaha YZ250\u003c\/h2\u003e\u003cp\u003eThis Wiseco single ring GP Series standard piston fits Yamaha YZ250 machines from 1999 through 2024, cross-referencing 808M06640 at a 66.40mm bore.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis 66.40mm GP Series piston is made for Yamaha YZ250 owners rebuilding the top end on 1999 to 2024 models. The single ring standard piston restores sealing and compression for dependable two-stroke power. It is aimed at motocross racers and weekend riders who need a reliable replacement piston for their YZ250.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eGP Series design tuned for high-revving two-stroke performance\u003c\/li\u003e\n\u003cli\u003eSingle ring layout lowers friction for crisp throttle response\u003c\/li\u003e\n\u003cli\u003e66.40mm standard bore matches the factory cylinder\u003c\/li\u003e\n\u003cli\u003eForged construction for durability under heat and load\u003c\/li\u003e\n\u003cli\u003eDesigned to cross-reference OEM number 808M06640\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\u003cli\u003efor Yamaha YZ250, 1999-2024\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop-end rebuilds during scheduled engine service\u003c\/li\u003e\n\u003cli\u003eMotocross racing on YZ250 two-stroke machines\u003c\/li\u003e\n\u003cli\u003eRestoring compression on worn or high-hour engines\u003c\/li\u003e\n\u003cli\u003ePre-season freshen-ups before race day\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e808M06640\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e66.40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRing Style\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSeries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGP Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Is this piston a direct replacement for my YZ250 top end? \u003cstrong\u003eA:\u003c\/strong\u003e It is designed as a standard bore replacement piston for the listed YZ250 model years, so confirm your bore size before ordering. \u003cstrong\u003eQ:\u003c\/strong\u003e Does the GP Series single ring piston need special break-in? \u003cstrong\u003eA:\u003c\/strong\u003e Follow normal two-stroke break-in with moderate throttle and heat cycles to seat the ring properly.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eSlight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Solid Spare","offers":[{"title":"Default Title","offer_id":51139970564182,"sku":"OO1C22373","price":439.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_398f0d2c-7157-4a84-9ada-852ec501fca4.jpg?v=1794565842","url":"https:\/\/www.solidspare.com\/products\/808m06640-wiseco-single-ring-gp-series-std-piston-for-yamaha-yz250-1999-2024-66","provider":"Solid Spare","version":"1.0","type":"link"}