{"product_id":"cylinder-works-21009-k01-big-bore-cylinder-kit-yamaha-yz250-moto-house-mx","title":"Cylinder Works Big Bore Cylinder Kit 21009-K01 — Yamaha YZ250 1999-2024","description":"\u003ch1\u003e\u003cstrong\u003eCylinder Works Big Bore Cylinder Kit 21009-K01 — Yamaha YZ250 1999-2024\u003c\/strong\u003e\u003c\/h1\u003e\n\n\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003eUnlock more power and torque with the \u003cstrong\u003eCylinder Works Big Bore Cylinder Kit\u003c\/strong\u003e, designed specifically to take your Yamaha YZ250 to 295cc. This kit is the perfect solution for riders looking for a significant performance boost without the complexity of engine machine work. Engineered to look virtually identical to your OEM cylinder, it provides a clean, factory-style installation while delivering enhanced displacement for superior off-road performance.\u003c\/p\u003e\n\u003cp\u003eEach kit comes complete with a precision-machined cylinder featuring a durable nickel silicon carbide sleeve for maximum heat dissipation and longevity. To ensure your engine runs quietly and efficiently, the kit includes a high-performance matching \u003cstrong\u003eVertex piston\u003c\/strong\u003e, along with all necessary rings, pins, clips, and gaskets for a total top-end rebuild. Proudly made in the USA, this kit is built to withstand the rigors of competitive riding.\u003c\/p\u003e\n\n\u003ch3\u003eTop Features: Cylinder Works Big Bore Kit\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eIncreases displacement to 295cc for improved low-to-mid range torque\u003c\/li\u003e\n  \u003cli\u003eIncludes matching Vertex piston for optimal performance and noise reduction\u003c\/li\u003e\n  \u003cli\u003eFeatures nickel silicon carbide cylinder sleeve for extreme durability\u003c\/li\u003e\n  \u003cli\u003e\"Drop-in\" design: No machine work required for installation\u003c\/li\u003e\n  \u003cli\u003eComplete kit includes cylinder, piston, rings, pin, clips, and gasket set\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\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\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;\"\u003e1999-2024\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;\"\u003eYZ250\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this kit require any modifications to my engine cases?\u003c\/strong\u003e\u003cbr\u003e\nA: No. This is a true drop-in kit. It is designed to fit your existing engine cases without the need for additional machining or boring.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the increased displacement affect the reliability of my bike?\u003c\/strong\u003e\u003cbr\u003e\nA: By using high-quality components like the included Vertex piston and the nickel silicon carbide-coated cylinder, this kit maintains excellent reliability while providing the added power of a 295cc build.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eExpert Pro-Tip:\u003c\/strong\u003e Whenever you move to a Big Bore kit, you are increasing the volume of the combustion chamber, which significantly alters your fuel requirements. You MUST re-jet your carburetor to account for the additional displacement. Failing to adjust your jetting will result in a lean condition, which can cause detonation and catastrophic engine failure very quickly.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eRecommended Pairings:\u003c\/strong\u003e\u003cbr\u003e\no \u003ca href=\"https:\/\/motohousemx.com\/collections\/yamaha-yz250-and-yz250x-performance-parts-collection-at-moto-house-mx\"\u003eYamaha YZ250 Performance Parts \u0026amp; Upgrades\u003c\/a\u003e\u003cbr\u003e\no \u003ca href=\"https:\/\/motohousemx.com\/collections\/yamaha-2-stroke-dirt-bikes-performance-parts-accessories-moto-house-mx\"\u003eYamaha 2-Stroke Performance Parts\u003c\/a\u003e\u003cbr\u003e\no \u003ca href=\"https:\/\/motohousemx.com\/collections\/premium-motorcycle-chemicals-brake-fluid-bike-wash-coolant-chain-lubes\"\u003eHigh-Performance 2-Stroke Engine Oil\u003c\/a\u003e\u003c\/p\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. Every order ships fast from our Central Florida location.\u003c\/p\u003e\n\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\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\/\",\n  \"@type\": \"Product\",\n  \"name\": \"Cylinder Works Big Bore Cylinder Kit 21009-K01\",\n  \"brand\": {\n    \"@type\": \"Brand\",\n    \"name\": \"Cylinder Works\"\n  },\n  \"sku\": \"21009-K01\",\n  \"description\": \"High-performance 295cc Big Bore Cylinder Kit for Yamaha YZ250. Includes Vertex piston and gaskets, no machining required.\",\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"url\": \"https:\/\/motohousemx.com\/\",\n    \"priceCurrency\": \"USD\",\n    \"availability\": \"https:\/\/schema.org\/InStock\"\n  }\n}\n\u003c\/script\u003e","brand":"Cylinder Works","offers":[{"title":"Default Title","offer_id":40497561665619,"sku":"21009-K01","price":1136.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/cylinder-works-big-bore-kit-295cc-21009-k01-1999-2023-yamaha-yz250-622741.jpg?v=1735340936","url":"https:\/\/motohousemx.com\/products\/cylinder-works-21009-k01-big-bore-cylinder-kit-yamaha-yz250-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}