{"product_id":"namura-020-over-bore-piston-rings-for-polaris-big-boss-250-1989-1993-72-5mm","title":"Namura .020 Over Bore Piston Rings for Polaris Big Boss 250 1989-1993 72.5mm","description":"\u003ch2\u003eNamura .020 Over Bore Piston Rings for Polaris\u003c\/h2\u003e\u003cp\u003eThese Namura .020 over bore piston rings for Polaris are engineered for cylinders that have been bored to 72.5mm to restore a factory-tight seal.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThe Namura .020 over bore piston rings for Polaris are precision-machined to provide an exact fit for refurbished engine cylinders. These Namura .020 over bore piston rings for Polaris accommodate the increased diameter resulting from professional machine shop work. Choosing these Namura .020 over bore piston rings for Polaris ensures the engine maintains correct compression ratios and reliable power delivery.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCorrect diameter for .020 oversized bores\u003c\/li\u003e\n\u003cli\u003eHigh quality sealing surface material\u003c\/li\u003e\n\u003cli\u003eEngineered for thermal expansion\u003c\/li\u003e\n\u003cli\u003eRestores factory level compression\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\u003cli\u003efor Polaris Big Boss 250 1989-1993\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eEngine rebuilds involving cylinder boring\u003c\/li\u003e\n\u003cli\u003eRestoring performance after block refinishing\u003c\/li\u003e\n\u003cli\u003eMaintaining engine health in high-mileage units\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBore Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e72.5mm\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 Do I need a machine shop for these? \u003cstrong\u003eA:\u003c\/strong\u003e These are for cylinders that have already been bored to 72.5mm by a machine shop.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e How do I confirm the size needed? \u003cstrong\u003eA:\u003c\/strong\u003e Measure your current cylinder bore or check your piston top for sizing stamps before selecting rings.\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":44792299159638,"sku":"SZ1F02414","price":32.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_3e400d52-c816-46c5-9cee-720b2f1c201c.jpg?v=1780066696","url":"https:\/\/www.solidspare.com\/products\/namura-020-over-bore-piston-rings-for-polaris-big-boss-250-1989-1993-72-5mm","provider":"Solid Spare","version":"1.0","type":"link"}