{"product_id":"namura-020-over-bore-piston-kit-for-yamaha-yz250-yz250x-fits-1999-2024-66-9mm","title":"Namura .020 Over Bore Piston Kit for Yamaha YZ250 \u0026 YZ250X fits 1999-2024 66.9mm","description":"\u003ch2\u003e.020 Over Bore Piston Kit for Yamaha\u003c\/h2\u003e\u003cp\u003eThis .020 over bore piston kit fits Yamaha YZ250 and YZ250X two-stroke models from 1999 to 2024, providing a high-quality replacement piston with a 66.9mm bore size for engine rebuilds or oversize bore applications.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis .020 over bore piston kit is designed for Yamaha YZ250 and YZ250X motorcycles manufactured between 1999 and 2024. It offers a durable piston ring set and wrist pin for a reliable top end rebuild, ensuring consistent power delivery and compression in your two-stroke engine.\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\u003e.020 inch oversize for worn cylinder bores\u003c\/li\u003e\n\u003cli\u003eDesigned for high-revving two-stroke applications\u003c\/li\u003e\n\u003cli\u003eTested for durability and heat resistance\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha YZ250 (1999-2024)\u003c\/li\u003e\n\u003cli\u003efor Yamaha YZ250X (1999-2024)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eMotocross and supercross racing\u003c\/li\u003e\n\u003cli\u003eEnduro and cross-country competition\u003c\/li\u003e\n\u003cli\u003eTrail riding and off-road use\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\u003e66.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOversize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e.020 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplacement\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e250cc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYears\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1999-2024\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 hone the cylinder before installing this piston? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, when installing an oversize piston the cylinder should be properly honed or bored to match the new piston for correct clearance and ring seating.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does this kit include a gasket set? \u003cstrong\u003eA:\u003c\/strong\u003e This is a piston kit only and does not include gaskets; a separate top end gasket kit is recommended for a complete rebuild.\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":44890494599254,"sku":"SZ1F11954","price":138.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_48016547-932a-4fcc-a86b-75b8a459b084.jpg?v=1781140741","url":"https:\/\/www.solidspare.com\/products\/namura-020-over-bore-piston-kit-for-yamaha-yz250-yz250x-fits-1999-2024-66-9mm","provider":"Solid Spare","version":"1.0","type":"link"}