{"product_id":"namura-020-over-bore-piston-rings-for-polaris-trail-boss-250-1985-1999-72-5mm","title":"Namura .020 Over Bore Piston Rings for Polaris Trail Boss 250 1985-1999 72.5mm","description":"\u003ch2\u003e.020 Over Bore Piston Rings for Polaris\u003c\/h2\u003e\u003cp\u003eThese Namura .020 over bore piston rings for Polaris Trail Boss 250 are engineered for 72.5mm cylinders to restore proper compression in 1985-1999 engines. These piston rings for Polaris are designed to provide a secure seal between the piston and cylinder wall.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThe Namura .020 over bore piston rings for Polaris serve as a replacement set for engine rebuilds or performance maintenance. These precision-manufactured piston rings for Polaris ensure reduced blow-by and improved combustion efficiency. They are intended for engine builders working on 250cc two-stroke machines.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eDurable material for high-heat resilience\u003c\/li\u003e\n\u003cli\u003eEngineered for .020 overbore applications\u003c\/li\u003e\n\u003cli\u003eMaintains consistent cylinder pressure\u003c\/li\u003e\n\u003cli\u003eStandard gap design for optimal expansion\u003c\/li\u003e\n\u003cli\u003eEngineered for long-term reliability\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\u003cli\u003efor Polaris Trail Boss 250 1985-1999\u003c\/li\u003e\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTop-end engine rebuilds\u003c\/li\u003e\n\u003cli\u003eRestoring compression in aging engines\u003c\/li\u003e\n\u003cli\u003eGeneral mechanical overhaul\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\u003e72.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCast\/Steel Alloy\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 to hone the cylinder? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, a fresh crosshatch pattern on the cylinder wall is necessary to ensure the rings seat correctly during break-in. \u003cstrong\u003eA:\u003c\/strong\u003e Failure to prepare the cylinder surface can lead to poor sealing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Are these rings for standard bore? \u003cstrong\u003eA:\u003c\/strong\u003e No, these are specifically sized for an .020 overbore condition.\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":44792267014230,"sku":"SZ1F01994","price":32.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_715fe77c-bb7f-465c-b223-d69f7c42ea72.jpg?v=1780064996","url":"https:\/\/www.solidspare.com\/products\/namura-020-over-bore-piston-rings-for-polaris-trail-boss-250-1985-1999-72-5mm","provider":"Solid Spare","version":"1.0","type":"link"}