{"product_id":"namura-020-over-bore-top-end-repair-kit-for-yamaha-pw50-fits-1990-2024-40-5mm","title":"Namura .020 Over Bore Top End Repair Kit for Yamaha PW50 fits 1990-2024 40.5mm","description":"\u003ch2\u003e.020 Over Bore Top End Repair Kit for Yamaha\u003c\/h2\u003e\u003cp\u003eThis top end repair kit, machined .020 oversize to 40.5mm, rebuilds the cylinder and piston assembly for Yamaha PW50 engines, providing a direct replacement for worn OEM components.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eDesigned for the Yamaha PW50, this .020 over bore top end repair kit delivers a complete cylinder and piston assembly at 40.5mm. It restores compression and performance in worn engines, making it ideal for ATV and dirt bike maintenance. The kit includes gaskets and rings for a straightforward rebuild.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePrecision-machined cylinder bore to 40.5mm with .020 overbore\u003c\/li\u003e\n\u003cli\u003eHigh-strength cast iron piston ring set for long life\u003c\/li\u003e\n\u003cli\u003eForged piston with reinforced wrist pin area\u003c\/li\u003e\n\u003cli\u003eComplete gasket and seal kit included\u003c\/li\u003e\n\u003cli\u003eDrop-in replacement for original Yamaha top end\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\u003cli\u003efor Yamaha PW50 (1990–2024)\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eRestoring top-end power on aged PW50 engines\u003c\/li\u003e\n\u003cli\u003eRebuilding after piston seizure or ring failure\u003c\/li\u003e\n\u003cli\u003eRefreshing an ATV or minibike for recreational riding\u003c\/li\u003e\n\u003cli\u003eMaintaining consistent compression for teaching new riders\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\u003e40.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOverbore\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e.020 (0.5mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYamaha PW50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYear Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1990–2024\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 Does this kit include a new cylinder? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, the kit includes a pre-honed cylinder and piston assembly, along with all necessary gaskets and rings for installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Will this work on a 2005 Yamaha PW50? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, this top end repair kit is designed for Yamaha PW50 models from 1990 to 2024, provided the engine has been bored .020 oversize.\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":44890379026518,"sku":"SZ1F10531","price":109.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_84f7f87e-a365-472c-8454-efaa38802d27.jpg?v=1781138549","url":"https:\/\/www.solidspare.com\/products\/namura-020-over-bore-top-end-repair-kit-for-yamaha-pw50-fits-1990-2024-40-5mm","provider":"Solid Spare","version":"1.0","type":"link"}