{"product_id":"namura-na-50006-2k-52-46-mm-0-50-mm-11-1-top-end-kit-for-polaris-sportsman-90-and-predator-90","title":"Namura NA-50006-2K 52.46 mm (+0.50 mm) 11:1 Top End Kit for Polaris Sportsman 90 and Predator 90","description":"\u003cp\u003eThe Namura NA-50006-2K Top End Kit is designed for select Polaris 90cc ATV applications requiring a 52.46 mm (+0.50 mm) piston and an 11:1 compression ratio. This complete kit includes the piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit for a convenient engine refresh. The kit fits the 2001–2006 Polaris Sportsman 90 and the 2003–2006 Polaris Predator 90.\u003c\/p\u003e\u003cp\u003eThe piston is manufactured using a hypereutectic casting process that increases silicon content to help control expansion, improve wear resistance, and withstand elevated cylinder temperatures. Its MOS2, or Teflon\/molybdenum, coated skirts are applied using a rolled-on process that creates a strong bond while helping reduce friction, improve heat transfer, and minimize the risk of cold seizures. These features support reliable performance during demanding ATV use.\u003c\/p\u003e\u003cp\u003eAdditional piston construction features include a machined smooth head that helps reflect combustion heat and reduce carbon buildup, along with an anodized dome engineered for improved heat resistance and durability. The Namura NA-50006-2K is intended for properly prepared engines using the specified oversize bore and should be verified against the existing cylinder, compression requirements, and engine condition before installation. Manufacturer part number: NA-50006-2K. Vendor part number: 186-50062.\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\u003e52.46 mm (+0.50 mm) piston size with an 11:1 compression ratio\u003c\/li\u003e\n\u003cli\u003eMOS2 Teflon\/molybdenum-coated piston 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 piston dome improves heat resistance and durability\u003c\/li\u003e\n\u003cli\u003eHypereutectic casting process provides controlled expansion, enhanced wear resistance, and increased high-temperature durability\u003c\/li\u003e\n\u003cli\u003eFits 2001–2006 Polaris Sportsman 90 models\u003c\/li\u003e\n\u003cli\u003eFits 2003–2006 Polaris Predator 90 models\u003c\/li\u003e\n\u003cli\u003eBrand: Namura\u003c\/li\u003e\n\u003cli\u003eManufacturer part number: NA-50006-2K\u003c\/li\u003e\n\u003cli\u003eVendor part number: 186-50062\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n2001 Polaris Sportsman 90\u003cbr\u003e\n2002 Polaris Sportsman 90\u003cbr\u003e\n2003 Polaris Predator 90\u003cbr\u003e\n2003 Polaris Sportsman 90\u003cbr\u003e\n2004 Polaris Predator 90\u003cbr\u003e\n2004 Polaris Sportsman 90\u003cbr\u003e\n2005 Polaris Predator 90\u003cbr\u003e\n2005 Polaris Sportsman 90\u003cbr\u003e\n2006 Polaris Predator 90\u003cbr\u003e\n2006 Polaris Sportsman 90","brand":"NAMURA","offers":[{"title":"Default Title","offer_id":67558656213227,"sku":"186-50062","price":54.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/d581-58a16f4e1fa8e.jpg?v=1790768506","url":"https:\/\/ctracingservices.com\/products\/namura-na-50006-2k-52-46-mm-0-50-mm-11-1-top-end-kit-for-polaris-sportsman-90-and-predator-90","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}