{"product_id":"namura-020-over-bore-piston-kit-for-polaris-big-boss-250-4x6-6x6-1989-93-72-5mm","title":"Namura .020 Over Bore Piston Kit for Polaris Big Boss 250 4x6 6x6 1989-93 72.5mm","description":"\u003ch2\u003e.020 Over Bore Piston Kit (72.5mm) for Polaris Big Boss 250\u003c\/h2\u003e\u003cp\u003eThis Namura .020 oversize piston kit is designed for Polaris Big Boss 250 4x6 and 6x6 models from 1989 to 1993, providing a 72.5mm bore for engines that require an overbore after wear.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis .020 over bore piston kit from Namura is built for Polaris Big Boss 250 ATVs, offering a precise 72.5mm piston that restores compression and power after cylinder wear. It includes the piston, rings, wrist pin, and circlips for a complete top-end overhaul.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eOversized 72.5mm piston machined from durable aluminum alloy\u003c\/li\u003e\n\u003cli\u003eMoly-coated skirt reduces friction and promotes long life\u003c\/li\u003e\n\u003cli\u003eChrome-plated rings provide excellent sealing and wear resistance\u003c\/li\u003e\n\u003cli\u003eWrist pin and circlips included for secure installation\u003c\/li\u003e\n\u003cli\u003eDesigned to match OEM .020 over specifications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor Polaris Big Boss 250 4x6 (1989-1993)\u003c\/li\u003e\n\u003cli\u003efor Polaris Big Boss 250 6x6 (1989-1993)\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\u003eOversize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.020 inch (0.50mm over)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Engines\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolaris Big Boss 250 (1989-1993)\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 Is this kit suitable for a standard bore cylinder? \u003cstrong\u003eA:\u003c\/strong\u003e No, this .020 over piston is intended for cylinders that have been machined to 72.5mm, typically after wear or damage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does the kit come with a gasket set? \u003cstrong\u003eA:\u003c\/strong\u003e No, gaskets are not included; we recommend ordering a top-end gasket set separately for your Polaris Big Boss 250.\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":44890489356374,"sku":"SZ1F11827","price":136.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/1_623cfefc-5be8-44e6-8647-1374b9cc012d.jpg?v=1781140568","url":"https:\/\/www.solidspare.com\/products\/namura-020-over-bore-piston-kit-for-polaris-big-boss-250-4x6-6x6-1989-93-72-5mm","provider":"Solid Spare","version":"1.0","type":"link"}