{"product_id":"478m08700-wiseco-std-piston-kit-for-yamaha-yz490-it490-1982-1984-87-00-mm","title":"478M08700 Wiseco Std Piston Kit for Yamaha YZ490 IT490 1982-1984 87.00 mm","description":"\u003ch2\u003eWiseco Std Piston Kit for Yamaha YZ490 \u0026amp; IT490\u003c\/h2\u003e\u003cp\u003eThis standard bore piston kit is a direct-fit replacement for the 1982-1984 Yamaha YZ490 and IT490, restoring compression and top-end power with the OEM cross-reference 478M08700 at a 87.00 mm bore size.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis Wiseco Std Piston Kit for Yamaha YZ490 \u0026amp; IT490 is a standard bore replacement piston assembly engineered for 1982-1984 models. It restores lost compression and top-end performance after a rebuild or top-end service. Riders and mechanics working on vintage Yamaha two-strokes will find this piston kit a dependable choice for keeping the 490 engine running strong.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eStandard 87.00 mm bore size for OEM-equivalent fitment\u003c\/li\u003e\n\u003cli\u003eForged piston construction for strength under high-rpm conditions\u003c\/li\u003e\n\u003cli\u003eKit includes piston, rings, wrist pin, and circlips for a complete top-end rebuild\u003c\/li\u003e\n\u003cli\u003eCross-references OEM part number 478M08700\u003c\/li\u003e\n\u003cli\u003eDesigned specifically for 1982-1984 Yamaha YZ490 and IT490 applications\u003c\/li\u003e\n\u003cli\u003ePrecision machined for consistent bore clearance and ring seal\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha YZ490 1982\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ490 1983\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ490 1984\u003c\/li\u003e\n\u003cli\u003efor Yamaha IT490 1982\u003c\/li\u003e\n\u003cli\u003efor Yamaha IT490 1983\u003c\/li\u003e\n\u003cli\u003efor Yamaha IT490 1984\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop-end rebuilds on vintage Yamaha 490 two-strokes\u003c\/li\u003e\n\u003cli\u003eRestoring compression after ring wear or piston scoring\u003c\/li\u003e\n\u003cli\u003eMotocross and trail riding on YZ490 and IT490 models\u003c\/li\u003e\n\u003cli\u003eWorkshop service on 1982-1984 Yamaha big-bore machines\u003c\/li\u003e\n\u003cli\u003eKeeping classic Yamaha engines in reliable running condition\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\u003e478M08700\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e87.00 mm (Standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Models\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYamaha YZ490, IT490 1982-1984\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKit Contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePiston, rings, wrist pin, circlips\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 a standard bore piston? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, this kit uses the 87.00 mm standard bore size and matches the OEM 478M08700 specification for 1982-1984 Yamaha YZ490 and IT490 engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What comes in the kit? \u003cstrong\u003eA:\u003c\/strong\u003e The kit includes the piston, rings, wrist pin, and circlips needed for a complete top-end rebuild on compatible Yamaha 490 models.\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":51140024402006,"sku":"OO1C22454","price":483.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_ea2a3fae-440f-47d5-960b-30562f31a1d7.jpg?v=1794565848","url":"https:\/\/www.solidspare.com\/products\/478m08700-wiseco-std-piston-kit-for-yamaha-yz490-it490-1982-1984-87-00-mm","provider":"Solid Spare","version":"1.0","type":"link"}