{"product_id":"namura-060-over-bore-top-end-repair-kit-for-yamaha-yz250-fits-2002-2024-67-9mm","title":"Namura .060 Over Bore Top End Repair Kit for Yamaha YZ250 fits 2002-2024 67.9mm","description":"\u003ch2\u003e.060 Over Bore Top End Repair Kit for Namura\u003c\/h2\u003e\u003cp\u003eThis top end repair kit is designed for the Yamaha YZ250, providing a .060 over bore size of 67.9mm to restore cylinder compression and performance. It serves as a complete replacement for worn top end components, including piston, rings, wrist pin, and circlips.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis .060 over bore top end repair kit from Namura is a comprehensive rebuild solution for the Yamaha YZ250 from 2002 to 2024. It includes a high-quality piston and ring set at 67.9mm bore, ensuring reliable power restoration for off-road and motocross use. The kit is engineered to match OEM specifications, making it a direct fit for your Yamaha engine rebuild.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePrecision-machined piston from 4032 aluminum alloy for strength and heat dissipation\u003c\/li\u003e\n\u003cli\u003ePlasma-moly ring set reduces friction and improves cylinder sealing\u003c\/li\u003e\n\u003cli\u003eProper wrist pin and circlips included for secure installation\u003c\/li\u003e\n\u003cli\u003eBore size of 67.9mm ensures exact .060 over clearance for worn cylinders\u003c\/li\u003e\n\u003cli\u003eCompatible with stock cylinder after machining to .060 over specification\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\u003cli\u003eFor Yamaha YZ250 (2002-2024)\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eMotocross and enduro racing requiring frequent top end rebuilds\u003c\/li\u003e\n\u003cli\u003eTrail riding where cylinder wear necessitates oversized piston\u003c\/li\u003e\n\u003cli\u003eRestoring power after excessive hours on worn piston and rings\u003c\/li\u003e\n\u003cli\u003eCompetition use where .060 over bore maximizes displacement within cylinder limits\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\u003e67.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOver Bore\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e.060 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYamaha YZ250 2002-2024\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKit Includes\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 Does this kit require cylinder boring? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, the cylinder must be machined to .060 over bore (67.9mm) to accept this piston. Always measure your cylinder before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Is a Namura piston as good as OEM? \u003cstrong\u003eA:\u003c\/strong\u003e Namura pistons are manufactured to strict tolerances using quality materials, offering a reliable alternative for rebuilds at a competitive price point.\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":44949749137494,"sku":"SZ1F13999","price":191.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_45c61392-74b4-4f9c-99c5-6d950ef5fc32.jpg?v=1781397921","url":"https:\/\/www.solidspare.com\/products\/namura-060-over-bore-top-end-repair-kit-for-yamaha-yz250-fits-2002-2024-67-9mm","provider":"Solid Spare","version":"1.0","type":"link"}