{"product_id":"cylinder-works-ch2005-k01-cylinder-head-yamaha-yz125-moto-house-mx","title":"Cylinder Works Cylinder Head CH2005-K01 — Yamaha YZ125 2005-2021","description":"\u003ch1\u003e\u003cstrong\u003eCylinder Works Cylinder Head CH2005-K01 — Yamaha YZ125 2005-2021\u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch2\u003eProduct Description\u003c\/h2\u003e\n\u003cp\u003eUnlock the potential of your \u003cstrong\u003eYamaha YZ125\u003c\/strong\u003e with the \u003cstrong\u003eCylinder Works Replacement Cylinder Head\u003c\/strong\u003e. Designed for riders who demand more from their 2-stroke engine, this high-performance component features a professional competition valve job, shortened valve guides to accommodate higher lift camshafts, and an unshrouded combustion chamber for optimized airflow. This head is precision-engineered to provide a significant upgrade over stock components, delivering improved power and responsiveness across the entire rev range.\u003c\/p\u003e\n\u003cp\u003eEach Cylinder Works head is manufactured in the USA, ensuring strict quality control and exceptional craftsmanship. The design includes a blended bowl seat-to-port transition to maintain smooth airflow, all while retaining a stock-shaped port geometry for easy integration into your existing setup. Please note that this is a \u003cstrong\u003ebare cylinder head\u003c\/strong\u003e—it does not include valves, springs, or lifters, allowing you to customize your build with the valvetrain components of your choice.\u003c\/p\u003e\n\u003ch3\u003eTop Features: Cylinder Works Cylinder Head\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProfessional-grade competition valve job for enhanced performance\u003c\/li\u003e\n\u003cli\u003eShortened valve guides optimized to accept higher lift cams\u003c\/li\u003e\n\u003cli\u003eUnshrouded combustion chamber design for maximum efficiency\u003c\/li\u003e\n\u003cli\u003eBlended bowl seat-to-port transition for improved flow characteristics\u003c\/li\u003e\n\u003cli\u003eManufactured in the USA to the highest quality standards\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;\"\u003e2005-2021\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;\"\u003eYZ125\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: Does this head come ready to bolt on?\u003c\/strong\u003e\u003cbr\u003eA: This is a bare cylinder head. It does not include valves, springs, or lifters. You will need to transfer your existing valvetrain or install new performance components before bolting the head onto your engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this compatible with a stock YZ125?\u003c\/strong\u003e\u003cbr\u003eA: Yes, it is designed for standard bore Yamaha YZ125 engines, but its performance-oriented features (like the competition valve job and unshrouded chamber) are specifically engineered to provide better results than a stock head.\u003c\/p\u003e\n\u003ch2\u003eExpert Pro-Tip\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eExpert Pro-Tip:\u003c\/strong\u003e Whenever you swap a cylinder head on a 2-stroke, always check your squish clearance with solder to ensure it falls within the manufacturer's recommended specifications for your fuel and compression ratio. Running a head with improper squish can lead to dangerous detonation, which will destroy a YZ125 top end in seconds. Precision here is the difference between a championship motor and a scrap heap.\u003c\/p\u003e\n\u003ch2\u003eRecommended Pairings\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eRecommended Pairings:\u003c\/strong\u003e\u003cbr\u003eo \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\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\/unlock-peak-performance-for-your-yamaha-yz125-high-quality-parts-accessories\"\u003eYZ125 Performance Upgrades\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eAbout Moto-House MX\u003c\/h2\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":40577010696275,"sku":"CH2005-K01","price":139.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1754\/5421\/files\/cylinder-works-cylinder-head-kit-ch2005-k01-2005-2021-yamaha-yz125-755558.jpg?v=1735340935","url":"https:\/\/motohousemx.com\/products\/cylinder-works-ch2005-k01-cylinder-head-yamaha-yz125-moto-house-mx","provider":"Moto-House MX","version":"1.0","type":"link"}