{"product_id":"namura-size-b-standard-bore-66-36mm-piston-kit-for-yamaha-yz250-1999-2024-66-4mm","title":"Namura Size B Standard Bore 66.36mm Piston Kit for Yamaha YZ250 1999-2024 66.4mm","description":"\u003ch2\u003eNamura Size B Standard Bore 66.36mm Piston Kit for Yamaha\u003c\/h2\u003e\u003cp\u003eThis standard bore piston kit is designed to replace the original piston in Yamaha YZ250 engines from 1999 to 2024 with a 66.4mm bore (size B).\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThe Namura Size B standard bore piston kit is a direct OEM replacement for Yamaha YZ250 two-stroke engines. This piston kit restores compression and power, featuring precision-machined components for a perfect fit. It is designed for riders who need a dependable piston for stock displacement.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePrecision-machined from high-strength aluminum alloy\u003c\/li\u003e\n\u003cli\u003eIncludes piston, rings, wrist pin, and circlips\u003c\/li\u003e\n\u003cli\u003eStandard bore 66.36mm piston for stock cylinder size\u003c\/li\u003e\n\u003cli\u003eDurable ring package for consistent seal\u003c\/li\u003e\n\u003cli\u003eLightweight design for minimal reciprocating mass\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\u003cli\u003efor Yamaha YZ250 (1999-2024)\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eIdeal for routine top-end rebuilds on YZ250 engines\u003c\/li\u003e\n\u003cli\u003eRestores factory compression for trail riding and motocross\u003c\/li\u003e\n\u003cli\u003eCommonly used in preventive maintenance rebuilds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiston Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e66.36mm (Size B)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard Cylinder Bore\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e66.4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiston Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eForged Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIncluded Components\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 compatible with a stock cylinder? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, this standard bore piston fits a stock 66.4mm cylinder with no overbore required.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What is the difference between size A and size B? \u003cstrong\u003eA:\u003c\/strong\u003e Size B pistons are slightly larger than size A, used when the cylinder is within tolerance but requires a slightly larger piston for proper clearance.\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":44890494238806,"sku":"SZ1F11944","price":138.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_521a2942-f5fe-491a-a396-c6877759fe70.jpg?v=1781140727","url":"https:\/\/www.solidspare.com\/products\/namura-size-b-standard-bore-66-36mm-piston-kit-for-yamaha-yz250-1999-2024-66-4mm","provider":"Solid Spare","version":"1.0","type":"link"}