{"product_id":"namura-na-50015-4k-top-end-kit-39-98-mm-1-00-mm-11-1-for-polaris-outlaw-50","title":"Namura NA-50015-4K Top End Kit, 39.98 mm +1.00 mm, 11:1, for Polaris Outlaw 50","description":"\u003cp\u003eRestore top-end performance with the Namura NA-50015-4K Top End Kit. Designed with a 39.98 mm +1.00 mm piston and an 11:1 compression ratio, this kit includes the essential components needed for a reliable piston replacement, including the piston, rings, wrist pin, wrist-pin clips, top-end bearing, and gasket kit. The kit is engineered for proper fitment and dependable service in compatible Polaris Outlaw 50 applications.\u003c\/p\u003e\u003cp\u003eThe Namura piston uses 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 use a rolled-on application process that creates a bond reported to be significantly stronger than spray-on coatings. This coating helps reduce friction, improve heat transfer, and minimize the risk of cold seizures during operation.\u003c\/p\u003e\u003cp\u003eAdditional piston design features support durability and combustion efficiency. The machined smooth head helps reflect combustion heat and reduce carbon buildup, while the anodized dome improves heat resistance and strength compared with non-anodized piston designs. These features help protect the piston in demanding riding conditions and support consistent engine performance.\u003c\/p\u003e\u003cp\u003eThis Namura top-end kit fits 2008 through 2017 Polaris Outlaw 50 models. Verify the model year, piston specification, and required oversize before installation. Manufacturer part number: NA-50015-4K. Vendor part number: 186-50154.\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, wrist-pin clips, top-end bearing, and gasket kit\u003c\/li\u003e\n\u003cli\u003e39.98 mm +1.00 mm piston: Provides the specified oversize configuration for compatible Polaris Outlaw 50 applications\u003c\/li\u003e\n\u003cli\u003e11:1 compression ratio: Designed for the specified engine configuration\u003c\/li\u003e\n\u003cli\u003eMOS2-coated skirts: Rolled-on Teflon\/molybdenum coating helps reduce friction, improve heat transfer, and minimize cold-seizure risk\u003c\/li\u003e\n\u003cli\u003eMachined smooth head: Helps reflect combustion heat and reduce carbon buildup on the piston\u003c\/li\u003e\n\u003cli\u003eAnodized dome: Improves heat resistance and durability compared with non-anodized piston designs\u003c\/li\u003e\n\u003cli\u003eHypereutectic casting: Increased silicon content helps control expansion, resist wear, and withstand higher cylinder temperatures\u003c\/li\u003e\n\u003cli\u003eFitment: Fits 2008-2017 Polaris Outlaw 50 models\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n2007 Polaris Predator 50\u003cbr\u003e\n2008 Polaris Outlaw 50\u003cbr\u003e\n2009 Polaris Outlaw 50\u003cbr\u003e\n2010 Polaris Outlaw 50\u003cbr\u003e\n2011 Polaris Outlaw 50\u003cbr\u003e\n2012 Polaris Outlaw 50\u003cbr\u003e\n2013 Polaris Outlaw 50\u003cbr\u003e\n2014 Polaris Outlaw 50\u003cbr\u003e\n2015 Polaris Outlaw 50\u003cbr\u003e\n2016 Polaris Outlaw 50\u003cbr\u003e\n2017 Polaris Outlaw 50\u003cbr\u003e\n2018 Polaris Outlaw 50","brand":"NAMURA","offers":[{"title":"Default Title","offer_id":67558620496107,"sku":"186-50154","price":97.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0611\/3882\/9547\/files\/183f-5b0d6accdc571_41ff64b2-2ff6-4a08-9b07-b8bd74b2a0d3.jpg?v=1790768230","url":"https:\/\/ctracingservices.com\/products\/namura-na-50015-4k-top-end-kit-39-98-mm-1-00-mm-11-1-for-polaris-outlaw-50","provider":"Cascade Tire \u0026 Racing Services","version":"1.0","type":"link"}