{"product_id":"394m08700-wiseco-080-piston-kit-for-yamaha-it400-yz400-1977-1978-87mm","title":"394M08700 Wiseco .080 Piston Kit for Yamaha IT400 YZ400 1977-1978 87mm","description":"\u003ch2\u003eWiseco .080 Piston Kit for Yamaha IT400 \u0026amp; YZ400\u003c\/h2\u003e\u003cp\u003eThis Wiseco .080 oversize piston kit for Yamaha IT400 and YZ400 restores top-end compression on 1977-1978 models, with OEM cross-reference 394M08700 at an 87.00 mm bore.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis Wiseco .080 piston kit for Yamaha IT400 and YZ400 is a forged oversize top-end solution for worn or scored cylinders that have been bored to 87.00 mm. The kit for Yamaha IT400 and YZ400 delivers the durability and consistent ring seal demanded on two-stroke singles, and the 394M08700 cross-reference helps confirm correct fitment.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eForged high-silicon aluminum construction for strength under two-stroke combustion loads\u003c\/li\u003e\n\u003cli\u003e.080 oversize at 87.00 mm bore to clean up worn or damaged cylinder walls\u003c\/li\u003e\n\u003cli\u003ePrecision-machined ring grooves for consistent ring seal and stable compression\u003c\/li\u003e\n\u003cli\u003eOEM cross-reference 394M08700 for fitment verification\u003c\/li\u003e\n\u003cli\u003eKit format supplies piston, rings, wrist pin, and circlips for a complete top-end rebuild\u003c\/li\u003e\n\u003cli\u003eDesigned to match the port timing and dome profile of the 400cc two-stroke engine\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha IT400 1977-1978\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ400 1977-1978\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop-end rebuild after a seize or loss of compression\u003c\/li\u003e\n\u003cli\u003eCylinder boring and honing to the .080 oversize\u003c\/li\u003e\n\u003cli\u003eVintage motocross and enduro engine refresh\u003c\/li\u003e\n\u003cli\u003eRestoration of 1977-1978 400cc two-stroke machines\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\u003e394M08700\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOversize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e.080\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\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003efor Yamaha IT400 \u0026amp; 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 Does this kit require cylinder machining? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, the .080 oversize piston needs the cylinder bored and honed to 87.00 mm with the correct clearance for a proper ring seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Is this an original Yamaha part? \u003cstrong\u003eA:\u003c\/strong\u003e No, this is an aftermarket Wiseco piston kit for Yamaha IT400 and YZ400 applications, referenced by OEM number 394M08700 for fitment matching.\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":51140134240342,"sku":"OO1C22606","price":461.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_c63bd39b-e62c-489b-be7d-3e44b122bbe9.jpg?v=1794565976","url":"https:\/\/www.solidspare.com\/products\/394m08700-wiseco-080-piston-kit-for-yamaha-it400-yz400-1977-1978-87mm","provider":"Solid Spare","version":"1.0","type":"link"}