{"product_id":"namura-na-50012-4k-87-93-mm-top-end-kit-for-polaris-850-models","title":"Namura NA-50012-4K 87.93 mm Top End Kit for Polaris 850 Models","description":"\u003cp\u003eRestore top-end performance with the Namura NA-50012-4K Top End Kit, designed for select Polaris 850 engines. This kit includes a piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit for a comprehensive replacement solution. With an 11:1 compression ratio and an 87.93 mm piston size, the kit is suited for service, rebuild, and performance maintenance applications.\u003c\/p\u003e\u003cp\u003eThe Namura piston uses a hypereutectic casting process with increased silicon content to help control expansion, improve wear resistance, and withstand elevated cylinder temperatures. MOS2, or Teflon and molybdenum, coated skirts are applied using a rolled-on process that creates a strong bond while reducing friction, improving heat transfer, and helping minimize cold-seizure risk. Machined smooth heads help reflect combustion heat and reduce carbon buildup, while anodized domes provide added heat resistance and durability.\u003c\/p\u003e\u003cp\u003eManufacturer part number NA-50012-4K and vendor part number 186-50124 identify this Namura top-end assembly. Fitment includes the 2015–2017 Polaris Sportsman 850 SP, 2015–2017 Polaris Sportsman Touring 850 SP, 2014 Polaris Scrambler XP 850, 2014 Polaris Scrambler XP 850 EPS, 2012 Polaris Sportsman Touring 850 EPS, and 2013 Polaris Sportsman Touring 850 EPS. Verify engine configuration and application details before installation to ensure proper compatibility.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eComplete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit\u003c\/li\u003e\n\u003cli\u003e87.93 mm piston size with an 11:1 compression ratio\u003c\/li\u003e\n\u003cli\u003eMOS2 Teflon and molybdenum coated skirts help reduce friction, improve heat transfer, and minimize cold-seizure risk\u003c\/li\u003e\n\u003cli\u003eMachined smooth piston heads help reflect combustion heat and reduce carbon buildup\u003c\/li\u003e\n\u003cli\u003eAnodized piston domes provide increased heat resistance and durability\u003c\/li\u003e\n\u003cli\u003eHypereutectic casting process delivers controlled expansion, improved wear resistance, and enhanced high-temperature performance\u003c\/li\u003e\n\u003cli\u003eFits select Polaris Sportsman 850 SP, Sportsman Touring 850 SP, Sportsman Touring 850 EPS, and Scrambler XP 850 models\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n2012 Polaris Sportsman Touring 850 EPS\u003cbr\u003e\n2013 Polaris Scrambler XP 850\u003cbr\u003e\n2013 Polaris Scrambler XP 850 EPS\u003cbr\u003e\n2013 Polaris Sportsman Touring 850 EPS\u003cbr\u003e\n2013 Polaris Sportsman XP 850 EPS\u003cbr\u003e\n2014 Polaris Scrambler XP 850\u003cbr\u003e\n2014 Polaris Scrambler XP 850 EPS\u003cbr\u003e\n2014 Polaris Sportsman Touring 850 EPS\u003cbr\u003e\n2015 Polaris Sportsman 850 SP\u003cbr\u003e\n2015 Polaris Sportsman Touring 850 SP\u003cbr\u003e\n2016 Polaris Sportsman 850 SP\u003cbr\u003e\n2016 Polaris Sportsman Touring 850 SP\u003cbr\u003e\n2017 Polaris Sportsman 850 SP\u003cbr\u003e\n2017 Polaris Sportsman Touring 850 SP\u003cbr\u003e\n2018 Polaris Sportsman 850 SP\u003cbr\u003e\n2018 Polaris Sportsman Touring 850 SP","brand":"NAMURA","offers":[{"title":"Default Title","offer_id":67558625673451,"sku":"186-50124","price":295.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/183f-5b0d6accdc571_e93c98f2-1a41-48c9-8ab6-313482caa5f0.jpg?v=1790768377","url":"https:\/\/ctracingservices.com\/products\/namura-na-50012-4k-87-93-mm-top-end-kit-for-polaris-850-models","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}