{"product_id":"namura-020-over-bore-piston-kit-for-polaris-trail-boss-250-1985-1999-72-5mm","title":"Namura .020 Over Bore Piston Kit for Polaris Trail Boss 250 1985-1999 72.5mm","description":"\u003ch2\u003eNamura .020 Over Bore Piston Kit for Polaris\u003c\/h2\u003e\u003cp\u003eThis piston kit is a .020 oversize replacement for Polaris Trail Boss 250 models from 1985 to 1999, featuring a 72.5mm bore diameter to restore engine compression and performance.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThe .020 over bore piston kit for Polaris Trail Boss 250 is a precision replacement designed for engines requiring oversize pistons after cylinder boring. This 72.5mm piston kit ensures proper fitment and performance for 1985-1999 models.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eManufactured from high-silicon aluminum alloy for durability and heat resistance\u003c\/li\u003e\n\u003cli\u003ePrecision ground piston skirt ensures proper cylinder wall contact\u003c\/li\u003e\n\u003cli\u003eIncludes piston pin and retaining clips for complete installation\u003c\/li\u003e\n\u003cli\u003e.020 oversize (72.5mm) matches standard rebore dimension\u003c\/li\u003e\n\u003cli\u003eDesigned for Polaris Trail Boss 250 engines\u003c\/li\u003e\n\u003cli\u003eRings included for immediate use\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\u003eRestores lost compression in high-mileage Trail Boss engines\u003c\/li\u003e\n\u003cli\u003eIdeal for engine rebuilds after cylinder scoring or ring failure\u003c\/li\u003e\n\u003cli\u003eCommonly used during full top-end overhauls on Polaris ATVs\u003c\/li\u003e\n\u003cli\u003eProvides reliable power for trail riding and utility use\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 Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e72.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOversize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e.020 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Models\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolaris Trail Boss 250 (1985-1999)\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 re-use my old piston pin? \u003cstrong\u003eA:\u003c\/strong\u003e It is recommended to use the included pin and clips for proper fit. Always follow your engine manual for assembly torque specs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Is any machining required for this oversize piston? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, the cylinder must be bored to the correct clearance for a 72.5mm piston. Have a professional machine shop perform this work.\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":44890489651286,"sku":"SZ1F11836","price":136.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_5fa77fad-4483-4c0b-b225-c3b820d43a39.jpg?v=1781140580","url":"https:\/\/www.solidspare.com\/products\/namura-020-over-bore-piston-kit-for-polaris-trail-boss-250-1985-1999-72-5mm","provider":"Solid Spare","version":"1.0","type":"link"}