{"product_id":"4976m07700-wiseco-std-piston-kit-for-yamaha-yz250f-2008-2011-77mm-14-1-cr","title":"4976M07700 Wiseco Std Piston Kit for Yamaha YZ250F 2008-2011 77mm 14:1 CR","description":"\u003ch2\u003eStd Piston Kit for Yamaha YZ250F\u003c\/h2\u003e\u003cp\u003eThis Wiseco standard bore piston kit for Yamaha YZ250F delivers a 77mm forged piston with a 14:1 compression ratio, cross-referenced under part number 4976M07700.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis standard piston kit for Yamaha YZ250F restores top-end power in 2008-2011 four-stroke motocross engines. Each kit is built around a 77mm forged piston running a 14:1 compression ratio for strong, reliable combustion. Riders and rebuilders choose this piston kit for Yamaha YZ250F service when factory bore dimensions need to be maintained.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eForged aluminum construction for high strength under combustion loads\u003c\/li\u003e\n\u003cli\u003e77mm standard bore diameter matches stock cylinder sizing\u003c\/li\u003e\n\u003cli\u003e14:1 compression ratio for strong mid-range and top-end response\u003c\/li\u003e\n\u003cli\u003eKit includes piston, rings, wrist pin, and circlips for a complete top-end refresh\u003c\/li\u003e\n\u003cli\u003eCross-reference 4976M07700 for verified application matching\u003c\/li\u003e\n\u003cli\u003eMachined ring grooves for consistent ring seal and compression\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha YZ250F 2008\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ250F 2009\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ250F 2010\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ250F 2011\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop-end rebuilds after piston wear or ring blow-by\u003c\/li\u003e\n\u003cli\u003eRoutine motocross engine refresh at factory bore size\u003c\/li\u003e\n\u003cli\u003eRace engine assembly where stock bore rules apply\u003c\/li\u003e\n\u003cli\u003eRestoring compression on high-hour YZ250F engines\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\u003e4976M07700\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e77mm standard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompression Ratio\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiston Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eForged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFitment Years\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2008-2011\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 Does this kit include rings and pin? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, this piston kit ships with the piston, rings, wrist pin, and circlips needed for a standard top-end rebuild. Confirm bore condition and clearance before assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Can I install this without machining? \u003cstrong\u003eA:\u003c\/strong\u003e This standard bore kit is designed to fit a stock-size cylinder in good condition. Measure the cylinder for wear and taper, and hone or replate as needed before fitting the new piston.\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":51139969482838,"sku":"OO1C22370","price":527.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_2236ee61-7622-4ae0-a551-c9840c3a0388.jpg?v=1794565864","url":"https:\/\/www.solidspare.com\/products\/4976m07700-wiseco-std-piston-kit-for-yamaha-yz250f-2008-2011-77mm-14-1-cr","provider":"Solid Spare","version":"1.0","type":"link"}