{"product_id":"standard-bore-piston-kit-for-polaris-trail-boss-250-1985-1999","title":"Standard Bore Piston Kit for Polaris Trail Boss 250 1985-1999","description":"\u003ch2\u003eStandard Bore Piston Kit for Polaris Trail Boss 250\u003c\/h2\u003e\u003cp\u003eThis standard bore piston kit is a direct replacement top-end component for the Polaris Trail Boss 250, restoring compression and dependable engine performance.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis standard bore piston kit for Polaris Trail Boss 250 models delivers a complete top-end refresh for worn or scored pistons. Engineered to factory bore dimensions, the kit restores compression, smooths out power delivery, and extends service life between rebuilds. It is a practical choice for riders and mechanics servicing 1985 through 1999 Trail Boss 250 machines.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eStandard bore sizing matches factory cylinder dimensions for a drop-in fit\u003c\/li\u003e\n\u003cli\u003ePrecision-machined piston body supports consistent ring sealing\u003c\/li\u003e\n\u003cli\u003eRing set included for a complete top-end service\u003c\/li\u003e\n\u003cli\u003eWrist pin and circlips supplied for straightforward installation\u003c\/li\u003e\n\u003cli\u003eConstruction suited to the heat and load cycles of two-stroke ATV engines\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 rebuilds after loss of compression\u003c\/li\u003e\n\u003cli\u003eRoutine engine refresh during seasonal maintenance\u003c\/li\u003e\n\u003cli\u003eRestoring trail and utility ATVs used for light hauling\u003c\/li\u003e\n\u003cli\u003eWorkshop repairs on older Polaris two-stroke machines\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\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Years\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1985-1999\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMachine\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003efor Polaris Trail Boss 250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKit Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePiston kit\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 Does this kit require cylinder boring? \u003cstrong\u003eA:\u003c\/strong\u003e Because it is a standard bore piston kit, it is intended for a cylinder that is still within factory spec and does not require overboring. Measure your bore before ordering to confirm it has not been enlarged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What should I check before installing a new piston? \u003cstrong\u003eA:\u003c\/strong\u003e Inspect the cylinder wall for scoring, verify ring end gap, and follow the recommended break-in procedure after assembly. Proper clearance and lubrication help the new top end seat correctly.\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":51144967487574,"sku":"OO1C25876","price":120.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_03f01da4-5535-4b55-8903-5bde218bdd5e.jpg?v=1794497172","url":"https:\/\/www.solidspare.com\/products\/standard-bore-piston-kit-for-polaris-trail-boss-250-1985-1999","provider":"Solid Spare","version":"1.0","type":"link"}