{"product_id":"cylinder-works-21002-k01-big-bore-cylinder-kit-yamaha-yz250f-moto-house-mx","title":"Cylinder Works Big Bore Cylinder Kit 21002-K01 — Yamaha YZ250F \/ WR250F 2001-2013","description":"\u003ch1\u003e\u003cstrong\u003eCylinder Works Big Bore Cylinder Kit 21002-K01 — Yamaha YZ250F \/ WR250F 2001-2013\u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003eTransform your classic 250cc machine into a high-torque powerhouse with the \u003cstrong\u003eCylinder Works Big Bore Cylinder Kit\u003c\/strong\u003e. Engineered to increase your displacement to \u003cstrong\u003e270cc\u003c\/strong\u003e, this kit is the perfect performance upgrade to revitalize an older YZ250F or WR250F, offering a noticeable boost in mid-range punch and overall engine output. This complete, bolt-on solution requires no machine work, making it the most efficient way to achieve significant performance gains.\u003c\/p\u003e\n\u003cp\u003eEach kit is proudly \u003cstrong\u003emade in the USA\u003c\/strong\u003e and includes a high-quality cylinder featuring a durable nickel silicon carbide sleeve for reduced friction and improved heat dissipation. We pair this with matching \u003cstrong\u003eVertex pistons\u003c\/strong\u003e to guarantee maximum longevity, consistent compression, and reduced engine noise. With a 12.5:1 compression ratio, you will enjoy improved throttle response and stronger power delivery on every ride.\u003c\/p\u003e\n\u003ch3\u003eTop Features: Cylinder Works Big Bore Kit\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIncreases displacement to 270cc for significant power gains\u003c\/li\u003e\n\u003cli\u003eIncludes matching Vertex pistons for optimal longevity and low noise\u003c\/li\u003e\n\u003cli\u003eAdvanced nickel silicon carbide cylinder coating for superior heat management\u003c\/li\u003e\n\u003cli\u003eComplete kit: includes cylinder, pistons, rings, pin, clips, and gaskets\u003c\/li\u003e\n\u003cli\u003ePrecision-engineered, bolt-on design—no machine work required\u003c\/li\u003e\n\u003cli\u003eProudly made in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003ePlease review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eFitment List\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #e0e0e0; margin-top: 15px; margin-bottom: 15px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f7f7f7;\"\u003e\n\u003cth style=\"border: 1px solid #e0e0e0; padding: 12px; text-align: left; font-weight: bold; color: #333333;\"\u003eYear Range\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #e0e0e0; padding: 12px; text-align: left; font-weight: bold; color: #333333;\"\u003eVehicle Brand\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #e0e0e0; padding: 12px; text-align: left; font-weight: bold; color: #333333;\"\u003eVehicle Model \u0026amp; Sub-Model\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003e2001-2013\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003eYamaha\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003eYZ250F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003e2001-2013\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003eYamaha\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #e0e0e0; padding: 10px; color: #555555;\"\u003eWR250F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this kit affect the reliability of my engine?\u003c\/strong\u003e\u003cbr\u003eA: Cylinder Works kits are engineered to be extremely reliable. By using high-quality Vertex pistons and nickel silicon carbide coatings, this kit is designed to handle the increased displacement while maintaining factory-like longevity when maintained properly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I need to re-jet my carburetor?\u003c\/strong\u003e\u003cbr\u003eA: Yes. Because you are increasing your displacement to 270cc, your engine will require more fuel. You should re-jet your carburetor to ensure the air\/fuel ratio is correct for the increased capacity.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExpert Pro-Tip:\u003c\/strong\u003e When installing a big bore kit, proper ring break-in is essential. Do not let the bike idle for long periods during the first heat cycle. Instead, take it for a moderate ride, varying the throttle—avoid sustained high RPMs initially—then let it cool down completely. This procedure helps the rings seat properly against the cylinder wall for maximum compression.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRecommended Pairings:\u003c\/strong\u003e\u003cbr\u003eo \u003ca href=\"https:\/\/motohousemx.com\/collections\/yamaha-yz250f-yz250fx-performance-parts-and-accessories\"\u003eYamaha YZ250F Performance Parts\u003c\/a\u003e\u003cbr\u003eo \u003ca href=\"https:\/\/motohousemx.com\/collections\/premium-motorcycle-chemicals-brake-fluid-bike-wash-coolant-chain-lubes\"\u003ePremium Motorcycle Chemicals\u003c\/a\u003e\u003cbr\u003eo \u003ca href=\"https:\/\/motohousemx.com\/collections\/yamaha-4-stroke-dirt-bikes-performance-parts-accessories-moto-house-mx\"\u003eYamaha 4-Stroke Performance Parts\u003c\/a\u003e\u003c\/p\u003e\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. Every order ships fast from our Central Florida location.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eMoto-House MX – Choice of Champions\u003c\/strong\u003e – Clermont \/ Montverde, FL. Central Florida's premier powersports source with lightning-fast worldwide shipping.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Cylinder Works","offers":[{"title":"Default Title","offer_id":40620392448083,"sku":"21002-K01","price":795.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/cylinder-works-big-bore-cylinder-kit-270cc-21002-k01-2001-2013-yamaha-yz250f-wr250f-573483.jpg?v=1735340935","url":"https:\/\/motohousemx.com\/products\/cylinder-works-21002-k01-big-bore-cylinder-kit-yamaha-yz250f-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}