{"product_id":"namura-standard-bore-piston-kit-size-c-for-yamaha-yz250f-wr250f-2001-2004-77mm","title":"Namura Standard Bore Piston Kit Size C for Yamaha YZ250F \u0026 WR250F 2001-2004 77mm","description":"\u003ch2\u003eNamura Standard Bore Piston Kit Size C for Yamaha\u003c\/h2\u003e\u003cp\u003eThis Namura standard bore piston kit is a direct replacement for Yamaha YZ250F and WR250F models from 2001 to 2004, featuring a 77mm bore size (size C) for rebuilding top-end performance.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis standard bore piston kit includes a forged piston, rings, wrist pin, and circlips, designed to restore compression in Yamaha 250F engines. The Size C (77mm) variant matches OEM specifications for these generations. It is intended for recreational and competition use, providing reliable power delivery.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eForged aluminum construction for strength and heat dissipation\u003c\/li\u003e\n\u003cli\u003ePrecision-machined ring grooves for consistent sealing\u003c\/li\u003e\n\u003cli\u003eIncludes a wrist pin with hardened surface for reduced wear\u003c\/li\u003e\n\u003cli\u003eCompatible with standard bore cylinders requiring no oversizing\u003c\/li\u003e\n\u003cli\u003eEach kit includes circlips for secure pin retention\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha YZ250F (2001-2004)\u003c\/li\u003e\n\u003cli\u003efor Yamaha WR250F (2001-2004)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eRebuilding top-end on dirt bikes after hours of use\u003c\/li\u003e\n\u003cli\u003eReplacing worn pistons during routine engine maintenance\u003c\/li\u003e\n\u003cli\u003eUsed in motocross and trail riding applications\u003c\/li\u003e\n\u003cli\u003eRestoring lost compression and engine power\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\u003eNamura Size C (77mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e77mm (Standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYamaha YZ250F \u0026amp; WR250F 2001-2004\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 piston kit for a 77mm standard bore? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, this is the Size C standard bore piston at 77mm, suitable for cylinders that have not been oversized.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Will this fit a 2003 YZ250F? \u003cstrong\u003eA:\u003c\/strong\u003e This kit is designed for 2001-2004 Yamaha YZ250F and WR250F models; confirm your engine serial number for exact fit.\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":44949785182294,"sku":"SZ1F14850","price":241.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_26cf8e31-c885-4629-80ff-44c26c439309.jpg?v=1781398966","url":"https:\/\/www.solidspare.com\/products\/namura-standard-bore-piston-kit-size-c-for-yamaha-yz250f-wr250f-2001-2004-77mm","provider":"Solid Spare","version":"1.0","type":"link"}