{"product_id":"namura-standard-bore-piston-kit-size-b-for-yamaha-yz250f-wr250f-2001-2004-77mm","title":"Namura Standard Bore Piston Kit Size B for Yamaha YZ250F \u0026 WR250F 2001-2004 77mm","description":"\u003ch2\u003eNamura Standard Bore Piston Kit Size B for Yamaha\u003c\/h2\u003e\u003cp\u003eThis aftermarket piston kit is a direct replacement for the original piston assembly in 2001-2004 Yamaha YZ250F and WR250F engines with a 77mm bore, restoring compression and performance.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThe Namura Standard Bore Piston Kit Size B is a high-quality replacement piston kit designed for 2001-2004 Yamaha YZ250F and WR250F motorcycles. This 77mm piston kit features precise manufacturing to ensure a proper fit and reliable operation, making it an ideal choice for rebuilding your top end. Riders trust this piston kit for its durability and consistent performance in off-road and motocross applications.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eStandard bore size B with 77mm diameter for precise cylinder fitment\u003c\/li\u003e\n\u003cli\u003eHigh-strength aluminum alloy construction for lightweight strength\u003c\/li\u003e\n\u003cli\u003eIncludes piston rings and wrist pin for a complete top-end rebuild\u003c\/li\u003e\n\u003cli\u003eManufactured to OEM specifications for seamless installation\u003c\/li\u003e\n\u003cli\u003eDesigned to withstand high RPM and heat loads common in four-stroke dirt bike engines\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\u003eRestoring top-end compression in a worn YZ250F engine\u003c\/li\u003e\n\u003cli\u003eRebuilding a WR250F after high-hour trail riding\u003c\/li\u003e\n\u003cli\u003eReplacing OEM piston during a full engine rebuild for motocross\u003c\/li\u003e\n\u003cli\u003ePreparing a 2003 YZ250F for competitive racing season\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e77mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiston Grade\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard B\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\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003eWill this piston kit fit a 2002 Yamaha YZ250F?\u003cstrong\u003eA:\u003c\/strong\u003eYes, the Namura Standard Bore Piston Kit Size B is designed for 2001-2004 YZ250F and WR250F models; confirm your cylinder bore is 77mm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003eDoes the kit include everything needed for installation?\u003cstrong\u003eA:\u003c\/strong\u003eYes, it comes with the piston, rings, and wrist pin, though you may need new gaskets and circlips separately.\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":44949785968726,"sku":"SZ1F14874","price":241.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_df82734e-c103-4134-90fa-5eb2ba08e75a.jpg?v=1781398995","url":"https:\/\/www.solidspare.com\/products\/namura-standard-bore-piston-kit-size-b-for-yamaha-yz250f-wr250f-2001-2004-77mm","provider":"Solid Spare","version":"1.0","type":"link"}