{"product_id":"100cc-head-assembly-64mm-for-scooter-big-bore-kit","title":"100cc Head Assembly (64mm) for Scooter Big Bore Kit","description":"\u003cdiv style='font-family: \"Market Sans\", Arial, sans-serif;'\u003eUpgrade your scooter’s performance with the \u003cspan style=\"font-weight: bold;\"\u003e100cc Big Bore Kit featuring 64mm valves\u003c\/span\u003e, engineered specifically for GY6 139QMB engines. This high-performance cylinder head assembly is designed to deliver a significant increase in power, torque, and overall engine efficiency. With precision-machined 64mm valves and a larger displacement, this kit ensures enhanced airflow and optimized combustion, resulting in quicker acceleration and a higher top-end speed. Whether you're commuting through city streets or cruising on open roads, this upgrade transforms your ride into a powerful, responsive machine.\u003c\/div\u003e\u003cdiv style='font-family: \"Market Sans\", Arial, sans-serif;'\u003e\u003cbr\u003e\u003c\/div\u003e\u003cdiv style='font-family: \"Market Sans\", Arial, sans-serif;'\u003eBuilt for durability and reliability, the 100cc Big Bore Kit is crafted from premium materials and manufactured to meet stringent quality standards. Its robust design withstands high-performance demands while ensuring a long service life. The bolt-on design allows for easy installation, making it perfect for DIY enthusiasts or professional mechanics looking for a dependable performance boost. Compatible with a wide range of Chinese-made scooters and mopeds running QMB139\/QMI139 4-stroke engines, this upgrade is your ticket to a more thrilling and dynamic riding experience.\u003c\/div\u003e\u003cdiv style='font-family: \"Market Sans\", Arial, sans-serif;'\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003ePerfect Fit: \u003c\/span\u003eOutfitted with oversized 64mm valves, 18mm intake and 16mm exhaust, this cylinder head allows superior air\/fuel intake and exhaust flow. The enhanced combustion efficiency translates to smoother throttle response, more complete fuel burn, and improved fuel economy, even while delivering enhanced power output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eWide Compatibility:\u003c\/span\u003e Compatible with a wide variety of Chinese-manufactured 50cc to 100cc mopeds and scooters, including brands like TaoTao, Jonway, Peace Sports, and more. Whether you're upgrading an old ride or building a custom scooter, this performance cylinder head ensures a reliable fit and optimized performance across the board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eMassive Power: \u003c\/span\u003eExperience an instant surge in engine performance with this 100cc Big Bore Kit. Designed to significantly increase displacement from standard 50cc\/80cc engines, this kit provides a dramatic improvement in torque and horsepower, allowing faster acceleration and a noticeable boost in top-end speed for GY6 139QMB scooters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eDurable Construction: \u003c\/span\u003eManufactured with premium-grade materials, this cylinder head and valve assembly ensures long-lasting durability under high-heat and high-RPM conditions. The robust build quality is ideal for performance riders, daily commuters, and anyone looking for a reliable upgrade that can withstand extended use without compromise.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eEasy Installation: \u003c\/span\u003eThis big bore kit is designed as a direct bolt-on replacement for QMB139\/QMI139 4-stroke engines with compatible intake (44.75mm) and exhaust (49.75mm) bolt hole spacing. Its user-friendly design makes installation straightforward for DIY users and professionals alike, no complex modifications required.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e\u003cdiv style='font-family: \"Market Sans\", Arial, sans-serif;'\u003e\u003cspan style=\"font-weight: bold;\"\u003eSpecs:\u003c\/span\u003e\u003c\/div\u003e\u003cdiv style='font-family: \"Market Sans\", Arial, sans-serif;'\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-weight: bold;\"\u003e64mm Valves\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eIntake Bolt Hole Spacing: \u003c\/span\u003e44.75mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eExhaust Bolt Hole Spacing:\u003c\/span\u003e 49.75mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eIntake Valve Diameter: \u003c\/span\u003e18mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eExhaust Valve Diameter:\u003c\/span\u003e 16mm\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e\u003cdiv style='font-family: \"Market Sans\", Arial, sans-serif;'\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eKnown to Fit: \u003c\/span\u003e\u003cul\u003e\n\u003cli\u003eUpgraded 100cc Cylinder Head \u0026amp; Valve Assembly QMB139 \/ QMI139 4-Stroke Engines.\u003c\/li\u003e\n\u003cli\u003eExact replacement part for many Chinese-manufactured brands and models of Chinese Mopeds and Scooters. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e ","brand":"United Express Distribution","offers":[{"title":"Default Title","offer_id":53092148740207,"sku":"HEAD-1064-U1","price":33.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/0368\/1391\/files\/head-0869a_43394df7-af52-49c8-99be-c160975afecd.jpg?v=1778739064","url":"https:\/\/uedist.com\/products\/100cc-head-assembly-64mm-for-scooter-big-bore-kit","provider":"United Express Distribution","version":"1.0","type":"link"}