{"product_id":"namura-020-over-bore-piston-kit-fits-polaris-850-scrambler-sportsman-87-5mm","title":"Namura .020 Over Bore Piston Kit fits Polaris 850 Scrambler \u0026 Sportsman 87.5mm","description":"\u003ch2\u003eNamura .020 Over Bore Piston Kit for Polaris\u003c\/h2\u003e\u003cp\u003eThis Namura .020 oversize piston kit fits Polaris 850 Scrambler and Sportsman models, providing a reliable 87.5mm bore replacement for worn or damaged factory pistons after an overbore.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThe Namura .020 over bore piston kit is a direct-fit replacement for Polaris 850 engines found in Scrambler and Sportsman ATVs, delivering consistent compression and power. This piston kit uses a 87.5mm bore size to restore engine performance after cylinder machining, making it a trusted option for rebuilding high-mileage or overheated motors.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePrecision-machined 87.5mm piston with .020 oversize\u003c\/li\u003e\n\u003cli\u003eHigh-silicone aluminum alloy reduces expansion and scuffing\u003c\/li\u003e\n\u003cli\u003eMoly-coated skirt for reduced friction and quicker break-in\u003c\/li\u003e\n\u003cli\u003eIncludes rings, wrist pin, and circlips for complete installation\u003c\/li\u003e\n\u003cli\u003eManufactured to meet or exceed OEM specifications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Polaris Scrambler 850\u003c\/li\u003e\n\u003cli\u003efor Polaris Sportsman 850\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eEngine rebuilding after top-end failure\u003c\/li\u003e\n\u003cli\u003eRestoring compression in worn 850 engines\u003c\/li\u003e\n\u003cli\u003eCylinder overbore to remove scoring or taper\u003c\/li\u003e\n\u003cli\u003ePerformance rebuilds requiring a fresh piston set\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\u003e87.5mm\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 (0.51mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolaris 850\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, 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 Can I install this piston without machining the cylinder? \u003cstrong\u003eA:\u003c\/strong\u003e No, a .020 over bore requires the cylinder to be professionally honed or bored to 87.5mm for proper clearance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does this kit work in a Polaris 850 RZR? \u003cstrong\u003eA:\u003c\/strong\u003e This kit is designed for Scrambler and Sportsman models; confirm with your engine serial number for compatibility with other Polaris 850 applications.\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":44890920550486,"sku":"SZ1F13574","price":175.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_b8159ec0-b992-448d-b253-0aeaf622c605.jpg?v=1781144295","url":"https:\/\/www.solidspare.com\/products\/namura-020-over-bore-piston-kit-fits-polaris-850-scrambler-sportsman-87-5mm","provider":"Solid Spare","version":"1.0","type":"link"}