{"product_id":"prox-01-4337-b-piston-kit-kawasaki-kx250f-moto-house-mx","title":"ProX 4-Stroke Piston Kit (76.97mm \/ Size B) 01.4337.B - Kawasaki KX250F 2006-2009","description":"\u003ch1\u003e\u003cstrong\u003eProX 4-Stroke Piston Kit (76.97mm \/ Size B) 01.4337.B - Kawasaki KX250F 2006-2009\u003c\/strong\u003e\u003c\/h1\u003e\n\n\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\n\u003cp\u003eThe ProX 01.4337.B 4-Stroke Piston Kit provides a precision-engineered top-end component package designed specifically for the \u003cstrong\u003eKawasaki KX250F\u003c\/strong\u003e. Engineered for riders servicing their 250cc power plant, this standard Size B assembly delivers an exact 76.97mm outer diameter dimension to match cylinders requiring a 77.00mm standard bore tolerance. Each package arrives as a complete assembly including the piston, matched piston rings, wrist pin, and circlips for a comprehensive top-end overhaul.\u003c\/p\u003e\n\n\u003cp\u003eManufactured utilizing a dedicated low-expansion, low-friction aluminum alloy, this piston is precision machined on modern CNC equipment to maintain dimensional stability under intense thermal loads. The non-coated skirt design and 13.5:1 compression ratio mirror the mechanical requirements of the four-stroke engine platform, ensuring proper combustion chamber sealing, minimal skirt friction, and consistent output throughout the RPM range.\u003c\/p\u003e\n\n\u003ch3\u003eTop Features: ProX Piston Kit\u003c\/h3\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eManufactured from low-expansion, low-friction aluminum alloy to withstand high thermal cycling without distorting.\u003c\/li\u003e\n\t\u003cli\u003eMachined on computer numerical control (CNC) equipment to maintain exact tolerances for a 77.00 mm standard bore.\u003c\/li\u003e\n\t\u003cli\u003eEngineered to deliver a 13.5:1 compression ratio tailored for the four-stroke 250cc combustion chamber profile.\u003c\/li\u003e\n\t\u003cli\u003eComplete rebuild kit configuration includes the aluminum alloy piston, matched rings, wrist pin, and retaining circlips.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003ePlease review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.\u003c\/p\u003e\n\n\u003ch3\u003eFitment List\u003c\/h3\u003e\n\n\u003ctable border=\"1\" cellpadding=\"5\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%\"\u003e\n\t\u003cthead\u003e\n\t\t\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\t\t\t\u003cth\u003eYear Range\u003c\/th\u003e\n\t\t\t\u003cth\u003eVehicle Brand\u003c\/th\u003e\n\t\t\t\u003cth\u003eVehicle Model \u0026amp; Sub-Model\u003c\/th\u003e\n\t\t\u003c\/tr\u003e\n\t\u003c\/thead\u003e\n\t\u003ctbody\u003e\n\t\t\u003ctr\u003e\n\t\t\t\u003ctd\u003e2006-2009\u003c\/td\u003e\n\t\t\t\u003ctd\u003eKawasaki\u003c\/td\u003e\n\t\t\t\u003ctd\u003eKX250F\u003c\/td\u003e\n\t\t\u003c\/tr\u003e\n\t\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What components are included in the ProX 01.4337.B piston kit?\u003c\/strong\u003e\u003cbr\u003e\nA: The kit contains one 76.97mm Size B aluminum alloy piston, a set of piston rings, a wrist pin, and two circlips.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What cylinder bore diameter and compression ratio are designed for this piston?\u003c\/strong\u003e\u003cbr\u003e\nA: This piston is designed for a standard 77.00mm cylinder bore and produces a 13.5:1 compression ratio.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eExpert Pro-Tip:\u003c\/strong\u003e Always measure the cylinder bore with a bore gauge at three heights (top, middle, bottom) and in two directions to verify the cylinder is within service limits and round before selecting your B-sized piston. When installing the piston rings, verify the end gap in the cylinder with a feeler gauge, stagger the ring end gaps according to the factory manual, and ensure the circlip end gaps point vertically at 6 o'clock or 12 o'clock.\u003c\/p\u003e\n\n\u003ch3\u003eRecommended Pairings:\u003c\/h3\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/kawasaki-kx250f-performance-upgrades-engine-mods-and-accessories-moto-house-mx\"\u003eKawasaki KX250F Performance Parts \u0026amp; Upgrades\u003c\/a\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/kawasaki-4-stroke-dirt-bikes-performance-parts-accessories-moto-house-mx\"\u003eKawasaki 4-Stroke Performance Parts\u003c\/a\u003e\u003c\/li\u003e\n\t\u003cli\u003e\u003ca href=\"https:\/\/motohousemx.com\/collections\/mx-off-road-motorcycle-tools\"\u003eMotorcycle Tools \u0026amp; Accessories\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eAt Moto-House MX, we carry the best brands in motocross and off-road performance. Our team has over 40 years of experience helping riders get more out of their bikes. We pride ourselves on great customer service, and every item ships FAST - straight to your door.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eMoto-House MX - Choice of Champions\u003c\/strong\u003e - Your premier powersports source with great customer service and lightning-fast shipping straight to your door.\u003c\/em\u003e\u003c\/p\u003e","brand":"PROX","offers":[{"title":"Default Title","offer_id":46089872375891,"sku":"01.4337.B","price":188.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/LG4E08349A-B961-42F3-8113-37A348840740.jpg?v=1788196736","url":"https:\/\/motohousemx.com\/products\/prox-01-4337-b-piston-kit-kawasaki-kx250f-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}