{"product_id":"namura-020-over-bore-top-end-kit-for-yamaha-big-bear-250-2007-2008-2009-71-5mm","title":"Namura .020 Over Bore Top End Kit for Yamaha Big Bear 250 2007 2008 2009 71.5mm","description":"\u003ch2\u003eNamura .020 Over Bore Top End Kit for Yamaha Big Bear 250\u003c\/h2\u003e\u003cp\u003eThis top end kit restores compression and performance in Yamaha Big Bear 250 ATVs from 2007-2009, featuring a .020 over bore (71.5mm) piston assembly for worn cylinders. It includes rings, wrist pin, and circlips.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThe Namura .020 over bore top end kit is designed for Yamaha Big Bear 250 models from 2007 through 2009, offering a precise 71.5mm piston for cylinder repair. This kit provides all necessary components to refresh the top end, restoring lost power and reducing oil consumption. Whether you are rebuilding a worn engine or upgrading performance, this top end kit delivers reliable fitment and durability.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePrecision-machined 71.5mm piston with .020 oversize for accurate cylinder fit\u003c\/li\u003e\n\u003cli\u003eHigh-strength rings reduce blow-by and improve compression\u003c\/li\u003e\n\u003cli\u003eHeat-treated wrist pin withstands high engine loads\u003c\/li\u003e\n\u003cli\u003eIncludes circlips for secure piston pin retention\u003c\/li\u003e\n\u003cli\u003eNamura quality construction ensures consistent tolerances\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Yamaha Big Bear 250 2007\u003c\/li\u003e\n\u003cli\u003efor Yamaha Big Bear 250 2008\u003c\/li\u003e\n\u003cli\u003efor Yamaha Big Bear 250 2009\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTrail riding and recreational ATV use\u003c\/li\u003e\n\u003cli\u003eUtility tasks like hauling and light towing\u003c\/li\u003e\n\u003cli\u003eEngine rebuilds to extend service life\u003c\/li\u003e\n\u003cli\u003eRestoring compression in high-mileage machines\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\u003e71.5mm\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTop End Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePiston Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCast aluminum\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 cylinder? \u003cstrong\u003eA:\u003c\/strong\u003e No, this is a piston and ring set; the existing cylinder must be bored to .020 over size to match.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Can I install this kit without professional help? \u003cstrong\u003eA:\u003c\/strong\u003e Top end work requires basic mechanical skills and proper tools; we recommend having a qualified technician perform the installation if you are not experienced.\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":44890904264790,"sku":"SZ1F13511","price":175.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_edf5e38c-df09-43b4-98d6-89812dd414a8.jpg?v=1781144214","url":"https:\/\/www.solidspare.com\/products\/namura-020-over-bore-top-end-kit-for-yamaha-big-bear-250-2007-2008-2009-71-5mm","provider":"Solid Spare","version":"1.0","type":"link"}