{"product_id":"namura-040-over-bore-top-end-kit-for-polaris-sportsman-850-scrambler-850-88mm","title":"Namura .040 Over Bore Top End Kit for Polaris Sportsman 850 \u0026 Scrambler 850 88mm","description":"\u003ch2\u003eNamura .040 Over Bore Top End Kit 88mm for Polaris\u003c\/h2\u003e\u003cp\u003eThis top end kit provides a .040 over bore piston and cylinder assembly for Polaris Sportsman 850 and Scrambler 850 engines using an 88mm bore size.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThe Namura .040 over bore top end kit offers a larger 88mm piston and matching cylinder to restore compression and power in worn Polaris Sportsman 850 and Scrambler 850 ATVs. This top end kit is an ideal solution for engines that require a second oversize rebuild, delivering increased displacement and improved throttle response. This top end kit includes all critical components for a complete top end overhaul.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eForged aluminum piston rated for high RPM and heat resistance\u003c\/li\u003e\n\u003cli\u003eHoned cylinder with cross-hatch finish for optimal ring seating\u003c\/li\u003e\n\u003cli\u003eIncludes piston rings, wrist pin, circlips, and cylinder assembly\u003c\/li\u003e\n\u003cli\u003e.040 over bore (88mm) provides additional displacement for extra torque\u003c\/li\u003e\n\u003cli\u003eDesigned to match OEM specifications for reliable fit and function\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Polaris Sportsman 850\u003c\/li\u003e\n\u003cli\u003efor Polaris Scrambler 850\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eRebuilding high-mileage engines after cylinder wear\u003c\/li\u003e\n\u003cli\u003eRestoring performance in Polaris ATVs used for trail riding\u003c\/li\u003e\n\u003cli\u003eUtility tasks requiring dependable engine output\u003c\/li\u003e\n\u003cli\u003eSport riding and light competition 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\u003e88mm\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.040 (0.040 inch)\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, cylinder\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 Can I use this .040 over bore top end kit on a Polaris Sportsman 850 that has never been rebuilt? \u003cstrong\u003eA:\u003c\/strong\u003e Only if the cylinder bore is already worn beyond the .020 over size; otherwise, you may need to match the over bore to the existing cylinder condition.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does this kit include the cylinder head gasket? \u003cstrong\u003eA:\u003c\/strong\u003e No, the cylinder head and base gaskets are not included and must be purchased separately 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":44949973106774,"sku":"SZ1F16454","price":461.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_a4dfdfbd-aa24-4937-84d9-a8bc5c55c3ca.jpg?v=1781401629","url":"https:\/\/www.solidspare.com\/products\/namura-040-over-bore-top-end-kit-for-polaris-sportsman-850-scrambler-850-88mm","provider":"Solid Spare","version":"1.0","type":"link"}