{"product_id":"namura-standard-bore-piston-rings-for-polaris-570-sportsman-rzr-ranger-99mm","title":"Namura Standard Bore Piston Rings for Polaris 570 Sportsman, RZR \u0026 Ranger 99mm","description":"\u003ch2\u003eStandard Bore Piston Rings for Polaris\u003c\/h2\u003e\u003cp\u003eNamura standard bore piston rings designed for Polaris 570 engines found in Sportsman, RZR, and Ranger models, featuring a 99mm bore size.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThese Namura standard bore piston rings are a direct replacement for the original rings in Polaris 570 engines. They fit Sportsman, RZR, and Ranger models with a 99mm cylinder bore, making these piston rings ideal for engine rebuilds on 570cc Polaris machines.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eMade from high-grade cast iron for wear resistance\u003c\/li\u003e\n\u003cli\u003ePrecision-machined ring faces for optimal cylinder seal\u003c\/li\u003e\n\u003cli\u003eStandard bore size (99mm) for stock cylinder dimensions\u003c\/li\u003e\n\u003cli\u003eIncludes top compression ring, second compression ring, and oil ring assembly\u003c\/li\u003e\n\u003cli\u003eCompatible with OEM and aftermarket pistons of standard size\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Polaris Sportsman 570\u003c\/li\u003e\n\u003cli\u003efor Polaris RZR 570\u003c\/li\u003e\n\u003cli\u003efor Polaris Ranger 570\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eRebuilding a Polaris 570 engine after a top-end failure\u003c\/li\u003e\n\u003cli\u003eRestoring compression on a high-mileage Sportsman 570\u003c\/li\u003e\n\u003cli\u003ePerforming a cylinder hone and ring replacement on a RZR 570\u003c\/li\u003e\n\u003cli\u003eReplacing piston rings during a full engine overhaul on a Ranger 570\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\u003e99mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRing Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard Bore (not oversize)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolaris 570 engine family (Sportsman, RZR, Ranger)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNamura\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 these rings be used with a .020 over bore piston? \u003cstrong\u003eA:\u003c\/strong\u003e No, these are standard bore rings for 99mm cylinders; they will not fit oversize pistons. Use Namura oversize rings for .020 or .040 over bores.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Do these rings require any special break-in procedure? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, after installation follow the engine manufacturer's break-in guidelines, typically avoiding sustained high RPM for the first hour of operation.\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":44847036366934,"sku":"SZ1F05018","price":48.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_fbe26add-4754-45a0-8323-42e950f4b56b.jpg?v=1781058764","url":"https:\/\/www.solidspare.com\/products\/namura-standard-bore-piston-rings-for-polaris-570-sportsman-rzr-ranger-99mm","provider":"Solid Spare","version":"1.0","type":"link"}