{"product_id":"394m08500-wiseco-std-piston-kit-for-yamaha-it400-yz400-1977-1978-85mm","title":"394M08500 Wiseco Std Piston Kit for Yamaha IT400 YZ400 1977-1978 85mm","description":"\u003ch2\u003eWiseco Std Piston Kit for Yamaha IT400 and YZ400\u003c\/h2\u003e\u003cp\u003eThis Wiseco Std Piston Kit, part 394M08500, is an 85.00 mm standard bore piston kit built for the 1977-1978 Yamaha IT400 and YZ400 dirt bikes.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThe Wiseco Std Piston Kit brings stock bore top-end performance back to the 1977-1978 Yamaha IT400 and YZ400. This 85.00 mm piston kit, part 394M08500, replaces worn or damaged pistons without changing the original cylinder bore. It suits vintage dirt bike owners and restorers rebuilding a stock top end for trail and motocross use.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e85.00 mm standard bore sizing matched to the stock Yamaha IT400 and YZ400 cylinder\u003c\/li\u003e\n\u003cli\u003eWiseco forged piston construction for strength under two-stroke dirt bike loads\u003c\/li\u003e\n\u003cli\u003ePart number 394M08500 identifies this exact kit for the 1977-1978 IT400 and YZ400\u003c\/li\u003e\n\u003cli\u003eComplete piston kit format intended for a straightforward top-end rebuild\u003c\/li\u003e\n\u003cli\u003eStandard bore design keeps the original cylinder dimensions intact\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha IT400, 1977\u003c\/li\u003e\n\u003cli\u003efor Yamaha IT400, 1978\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ400, 1977\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ400, 1978\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop-end rebuilds on 1977-1978 Yamaha IT400 and YZ400 dirt bikes\u003c\/li\u003e\n\u003cli\u003eRestoring compression on a stock-bore two-stroke engine\u003c\/li\u003e\n\u003cli\u003eVintage dirt bike restoration projects\u003c\/li\u003e\n\u003cli\u003eTrail riding and motocross engine service\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\u003e394M08500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e85.00 mm\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\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003efor Yamaha IT400 and YZ400, 1977-1978\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 kit a standard bore or oversize? \u003cstrong\u003eA:\u003c\/strong\u003e It is a standard bore kit at 85.00 mm, part 394M08500, made for the stock Yamaha IT400 and YZ400 cylinder.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What should I check before installing it? \u003cstrong\u003eA:\u003c\/strong\u003e Confirm your machine is a 1977-1978 Yamaha IT400 or YZ400 and that the cylinder is at stock bore before ordering this kit.\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":51140133650518,"sku":"OO1C22605","price":439.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_3e1e2525-14c2-4c93-8f92-d6dc38c92e90.jpg?v=1794565963","url":"https:\/\/www.solidspare.com\/products\/394m08500-wiseco-std-piston-kit-for-yamaha-it400-yz400-1977-1978-85mm","provider":"Solid Spare","version":"1.0","type":"link"}