{"product_id":"478m08850-wiseco-060-piston-kit-for-yamaha-yz490-it490-1982-1984-88-50-mm","title":"478M08850 Wiseco .060 Piston Kit for Yamaha YZ490 IT490 1982-1984 88.50 mm","description":"\u003ch2\u003eWiseco .060 Piston Kit for Yamaha YZ490 \u0026amp; IT490\u003c\/h2\u003e\u003cp\u003eThis Wiseco .060 oversized piston kit for Yamaha YZ490 and IT490 models restores top end compression, with an 88.50 mm bore size and OEM cross reference 478M08850.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis Wiseco .060 piston kit for Yamaha YZ490 and IT490 machines is a top end rebuild component designed to restore compression and power after cylinder wear or a seize. It suits riders and mechanics rebuilding a 1982 to 1984 two stroke engine who need a proven oversized piston. The kit is built to the 88.50 mm bore spec and cross references 478M08850 for easy lookup.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eWiseco forged piston construction for strength under high rpm two stroke loads\u003c\/li\u003e\n\u003cli\u003e.060 inch oversize to clean up a worn or scored cylinder bore\u003c\/li\u003e\n\u003cli\u003e88.50 mm piston diameter matched to the listed bore size\u003c\/li\u003e\n\u003cli\u003eKit format with piston, rings, wrist pin, and circlips for a complete top end refresh\u003c\/li\u003e\n\u003cli\u003eCross reference 478M08850 for simplified part matching\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha YZ490, 1982 to 1984\u003c\/li\u003e\n\u003cli\u003efor Yamaha IT490, 1982 to 1984\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop end rebuild after a piston seize or cylinder scoring\u003c\/li\u003e\n\u003cli\u003eRestoring compression on a high hour two stroke motocross or enduro engine\u003c\/li\u003e\n\u003cli\u003eRoutine rebuild during a full engine refresh\u003c\/li\u003e\n\u003cli\u003eBore cleanup when the cylinder is machined to the next oversize\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\u003e478M08850\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiston Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e88.50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOversize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e.060 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWiseco\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePiston kit\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 piston kit need cylinder machining? \u003cstrong\u003eA:\u003c\/strong\u003e A .060 oversize piston normally requires the cylinder to be bored and honed to match the 88.50 mm size for correct clearance. Confirm your cylinder can accept this oversize before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What is included in the kit? \u003cstrong\u003eA:\u003c\/strong\u003e Wiseco piston kits typically include the piston, rings, wrist pin, and circlips. Verify the exact contents against the 478M08850 listing before purchase.\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":51140025417814,"sku":"OO1C22456","price":505.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_410d8bff-816a-4462-919e-d5997eeb15bb.jpg?v=1794565833","url":"https:\/\/www.solidspare.com\/products\/478m08850-wiseco-060-piston-kit-for-yamaha-yz490-it490-1982-1984-88-50-mm","provider":"Solid Spare","version":"1.0","type":"link"}