{"product_id":"4650m09200-wiseco-std-piston-kit-for-yamaha-yz400f-wr400f-1998-2000-92mm-13-5-1","title":"4650M09200 Wiseco Std Piston Kit for Yamaha YZ400F WR400F 1998-2000 92mm 13.5:1","description":"\u003ch2\u003eWiseco Std Piston Kit for Yamaha YZ400F\/WR400F\u003c\/h2\u003e\u003cp\u003eThis Wiseco standard bore piston kit for Yamaha YZ400F and WR400F models delivers a 92mm bore at 13.5:1 compression, cross-referenced to part 4650M09200.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis Wiseco standard piston kit is a forged replacement piston built for Yamaha YZ400F and WR400F four-stroke engines. The 92mm standard bore piston maintains a 13.5:1 compression ratio for strong, reliable power across the rev range. Riders freshening up a worn top end will find this Wiseco piston kit a direct-fit option for their Yamaha 400cc thumper.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eForged aluminum construction for high-strength durability under race conditions\u003c\/li\u003e\n\u003cli\u003e92mm standard bore size matching the original cylinder dimension\u003c\/li\u003e\n\u003cli\u003e13.5:1 compression ratio for crisp throttle response and strong power\u003c\/li\u003e\n\u003cli\u003ePrecision-machined ring grooves for consistent ring seal\u003c\/li\u003e\n\u003cli\u003eCross-reference part number 4650M09200 for easy verification\u003c\/li\u003e\n\u003cli\u003eIncludes piston, rings, wrist pin, and circlips in a complete kit\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha YZ400F 1998-2000\u003c\/li\u003e\n\u003cli\u003efor Yamaha WR400F 1998-2000\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop-end rebuilds on YZ400F and WR400F motocross and enduro bikes\u003c\/li\u003e\n\u003cli\u003eStandard bore service when the cylinder remains within spec\u003c\/li\u003e\n\u003cli\u003eTrail and track riding where reliable compression matters\u003c\/li\u003e\n\u003cli\u003eRestoring power lost to a worn or scored stock piston\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\u003e4650M09200\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e92mm standard bore\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompression Ratio\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13.5:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiston Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eForged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFitment Years\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1998-2000\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 Do I need to bore the cylinder for this piston? \u003cstrong\u003eA:\u003c\/strong\u003e No, this is a standard bore piston, so the cylinder should be within factory spec and typically honed only. Verify your cylinder bore and taper before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What is included with this kit? \u003cstrong\u003eA:\u003c\/strong\u003e The kit ships with the piston, rings, wrist pin, and circlips for a complete top-end rebuild. Check your service manual for torque specs and ring gap during assembly.\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":51139967123542,"sku":"OO1C22365","price":549.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_a1d24beb-5d72-4850-91fb-1ea0fa4c7731.jpg?v=1794565866","url":"https:\/\/www.solidspare.com\/products\/4650m09200-wiseco-std-piston-kit-for-yamaha-yz400f-wr400f-1998-2000-92mm-13-5-1","provider":"Solid Spare","version":"1.0","type":"link"}