{"product_id":"namura-na-50012-bk-top-end-kit-for-polaris-850-models-86-94-mm-11-1-compression","title":"NAMURA NA-50012-BK Top End Kit for Polaris 850 Models, 86.94 mm, 11:1 Compression","description":"\u003cp\u003eThe NAMURA NA-50012-BK Top End Kit is designed for select Polaris 850 ATV applications and provides the essential components needed to service the upper end of the engine. This kit includes a piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit for a comprehensive replacement solution. The 86.94 mm piston is engineered for a 11:1 compression ratio and is suitable for the listed Polaris Sportsman, Sportsman Touring, and Scrambler XP 850 models.\u003c\/p\u003e\u003cp\u003eNAMURA uses a hypereutectic casting process to increase silicon content, helping reduce expansion rates while improving wear resistance and the ability to withstand elevated cylinder temperatures. The piston skirts feature a rolled-on MOS2 coating made with Teflon and molybdenum. This bonded coating is designed to reduce friction, improve heat transfer, and help minimize the risk of cold seizures during operation.\u003c\/p\u003e\u003cp\u003eThe piston also features machined smooth heads to reflect combustion heat and help reduce carbon buildup, supporting piston protection and consistent engine performance. Anodized domes improve heat resistance and durability, providing added protection in demanding riding conditions. The kit is intended for direct service of compatible original-equipment engine configurations; verify the engine model and existing bore specifications before installation.\u003c\/p\u003e\u003cp\u003eFitment includes 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. The manufacturer part number is NA-50012-BK, and the vendor part number is 186-5012B.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eComplete top-end service kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit\u003c\/li\u003e\n\u003cli\u003e86.94 mm piston with an 11:1 compression ratio for compatible Polaris 850 engine applications\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 head helps reflect combustion heat and reduce carbon buildup\u003c\/li\u003e\n\u003cli\u003eAnodized dome improves heat resistance and piston durability\u003c\/li\u003e\n\u003cli\u003eHypereutectic casting process provides reduced expansion, increased wear resistance, and improved high-temperature performance\u003c\/li\u003e\n\u003cli\u003eFits select Polaris Sportsman, Sportsman Touring, and Scrambler XP 850 models\u003c\/li\u003e\n\u003cli\u003eBrand: NAMURA\u003c\/li\u003e\n\u003cli\u003eManufacturer part number: NA-50012-BK\u003c\/li\u003e\n\u003cli\u003eVendor part number: 186-5012B\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":67558621479147,"sku":"186-5012B","price":295.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/183f-5b0d6accdc571_cb28e890-864b-4078-99c9-eebe517b22fd.jpg?v=1790768340","url":"https:\/\/ctracingservices.com\/products\/namura-na-50012-bk-top-end-kit-for-polaris-850-models-86-94-mm-11-1-compression","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}