{"product_id":"namura-060-over-bore-piston-kit-for-polaris-trail-boss-250-1985-1999-73-5mm","title":"Namura .060 Over Bore Piston Kit for Polaris Trail Boss 250 1985-1999 73.5mm","description":"\u003ch2\u003eNamura .060 Over Bore Piston Kit for Polaris\u003c\/h2\u003e\u003cp\u003eThis Namura .060 over bore piston kit is a direct replacement for Polaris Trail Boss 250 ATVs from 1985 to 1999, featuring a 73.5mm bore size for oversized engine rebuilding.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThe Namura .060 over bore piston kit provides a complete piston assembly for Polaris Trail Boss 250 engines, designed to accommodate an oversized bore for cylinder resurfacing. This kit is ideal for rebuilding worn engines and restoring power, with a 73.5mm bore for a .060 over size. It is a reliable choice for ATV enthusiasts performing a top-end rebuild.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eManufactured from high-strength aluminum alloy for long life\u003c\/li\u003e\n\u003cli\u003eIncludes piston, rings, wrist pin, and circlips for complete installation\u003c\/li\u003e\n\u003cli\u003ePrecision machined to .060 over size (73.5mm) for resurfaced cylinders\u003c\/li\u003e\n\u003cli\u003eDesigned to meet OEM specifications for Polaris 250cc engines\u003c\/li\u003e\n\u003cli\u003eProvides improved compression and engine efficiency\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 engine performance in worn Polaris Trail Boss 250 ATVs\u003c\/li\u003e\n\u003cli\u003eCommonly used in trail riding, utility work, and recreational ATV use\u003c\/li\u003e\n\u003cli\u003eIdeal for top-end rebuilds after cylinder boring to .060 over\u003c\/li\u003e\n\u003cli\u003eHelps extend engine life and maintain reliable power output\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\u003e73.5mm (.060 over)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine Displacement\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e250cc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolaris Trail Boss 250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYears\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1985-1999\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 Will this piston kit work with my 1990 Polaris Trail Boss 250? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, this kit fits 1985-1999 models, but confirm your cylinder bore size and serial number before ordering to ensure proper fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Do I need to bore the cylinder to use this kit? \u003cstrong\u003eA:\u003c\/strong\u003e This .060 over piston kit requires the cylinder to be bored to 73.5mm, so professional machining is recommended before installation.\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":44890490110038,"sku":"SZ1F11849","price":136.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_69b22d4e-db6a-41b5-ae0d-f181b7484c03.jpg?v=1781140598","url":"https:\/\/www.solidspare.com\/products\/namura-060-over-bore-piston-kit-for-polaris-trail-boss-250-1985-1999-73-5mm","provider":"Solid Spare","version":"1.0","type":"link"}