{"product_id":"677m06900-wiseco-040-piston-kit-for-yamaha-yz250-wr250-1992-1998-69-00-mm","title":"677M06900 Wiseco .040 Piston Kit for Yamaha YZ250 WR250 1992-1998 69.00 mm","description":"\u003ch2\u003eWiseco .040 Piston Kit for Yamaha YZ250 \u0026amp; WR250\u003c\/h2\u003e\u003cp\u003eThis Wiseco .040 overbore piston kit (part 677M06900, 69.00 mm) is a forged piston assembly that restores compression, seals the combustion chamber, and transfers power in 1992-1998 Yamaha YZ250 and WR250 two-stroke engines. It is made for riders who are rebuilding a worn top end or boring the cylinder to the next oversize. The .040 piston kit delivers the durability and consistent fit that high-revving motocross and off-road engines demand.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eForged from high-strength aluminum alloy, this Wiseco .040 piston kit is engineered to handle the heat and stress of two-stroke operation. It serves riders and mechanics rebuilding 1992-1998 Yamaha YZ250 and WR250 machines that need a fresh bore. Each kit includes the piston and supporting components required for the .040 oversize installation.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eForged piston construction for high strength and heat resistance under two-stroke loads\u003c\/li\u003e\n\u003cli\u003ePrecision machined to a 69.00 mm oversize diameter for a true cylinder fit\u003c\/li\u003e\n\u003cli\u003eDesigned to restore compression and combustion sealing in worn top ends\u003c\/li\u003e\n\u003cli\u003eOversize bore matches cylinders machined to the .040 step\u003c\/li\u003e\n\u003cli\u003eKit format supplies the parts needed for a complete piston replacement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha YZ250, 1992-1998\u003c\/li\u003e\n\u003cli\u003efor Yamaha WR250, 1992-1998\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop-end rebuilds on 1992-1998 Yamaha YZ250 and WR250 two-strokes\u003c\/li\u003e\n\u003cli\u003eCylinder boring and honing jobs that use a .040 oversize piston\u003c\/li\u003e\n\u003cli\u003eMotocross and off-road engine refresh programs\u003c\/li\u003e\n\u003cli\u003eRace engine builds needing a fresh, true-bore top end\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\u003e677M06900\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiston Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e69.00 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.040\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 Will this piston fit a standard-bore cylinder? \u003cstrong\u003eA:\u003c\/strong\u003e No, this is a .040 oversize piston and requires the cylinder to be bored and honed to match the 69.00 mm diameter. Always confirm your intended bore size before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does the kit include rings and a pin? \u003cstrong\u003eA:\u003c\/strong\u003e The kit is a Wiseco piston assembly built for the .040 oversize application. Review the listing contents or contact us to confirm exactly which components ship with this specific 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":51140050419798,"sku":"OO1C22491","price":417.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_c8a9bda5-e3c6-4b98-a509-cabf942f8227.jpg?v=1794565929","url":"https:\/\/www.solidspare.com\/products\/677m06900-wiseco-040-piston-kit-for-yamaha-yz250-wr250-1992-1998-69-00-mm","provider":"Solid Spare","version":"1.0","type":"link"}