{"product_id":"100cc-52-4mm-complete-cylinder-kit-with-64mm-valves-for-qmb139-qmi139-4-stroke-engines-atv-dirt-bike","title":"100cc 52.4mm Complete Cylinder Kit with 64mm Valves for QMB139 QMI139 4-Stroke Engines ATV Dirt Bike","description":"\u003cdiv style='font-family: \"Market Sans\", Arial, sans-serif;'\u003eUpgrade your scooter or ATV’s engine performance with the \u003cspan style=\"font-weight: bold;\"\u003eRedCap 100cc 52.4mm Complete Cylinder Kit,\u003c\/span\u003e designed specifically for QMB139 and QMI139 4-stroke engines. This high-performance kit features a robust cylinder block, precision-machined cylinder head with 64mm valves, a durable piston, a full set of piston rings, pin, and circlips for a complete top-end rebuild. Also included are essential gaskets—cylinder head, base, and intake—for a secure, leak-proof installation. Whether you're replacing worn-out parts or enhancing engine capacity on your GY6 50cc, 80cc, or 100cc engine, this kit delivers reliable compression, smoother operation, and improved power output.\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;'\u003eDesigned with compatibility in mind, this kit is known to fit a wide range of Chinese scooters, mopeds, and ATVs from popular brands like TaoTao, Jonway, Roketa, Peace, Baccio, and Baotian. Featuring 18mm intake and 16mm exhaust valves with precise bolt hole spacing (44.75mm intake and 49.75mm exhaust), it ensures an easy fit without complicated modifications. Whether you're a DIY enthusiast or a mechanic, the RedCap 100cc kit provides a dependable and cost-effective solution for restoring or upgrading engine performance with OEM-level precision.\u003c\/div\u003e\u003cdiv style='font-family: \"Market Sans\", Arial, sans-serif;'\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eWide Compatibility:\u003c\/span\u003e Fits Chinese GY6 scooters, ATVs, dirt bikes, and go-karts with QMB139 \/ QMI139 engines. Compatible with brands like TaoTao, Jonway, Roketa, Baotian, Baccio, and more—ideal for engine upgrades, replacements, or power rebuilds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eComplete Kit:\u003c\/span\u003e Includes 52.4mm cylinder block, pre-installed 64mm valve head, piston, rings, gaskets, and valve rockers, everything needed to rebuild or upgrade your GY6 QMB139 50cc–100cc engine for improved power and long-lasting performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eEngine Power: \u003c\/span\u003eEnhance your scooter or ATV’s torque and top speed with this 100cc big bore kit. Optimized airflow from larger valves ensures better combustion and acceleration, giving your 4-stroke engine a significant performance upgrade on every ride.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eDurable Construction: \u003c\/span\u003eMade from high-quality materials, this kit resists heat, vibration, and wear. Intake bolt spacing is 44.75mm, exhaust is 49.75mm—designed to OEM specs for a secure and precise fit on QMB139 \/ QMI139 4-stroke Chinese engine types.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eEasy Installation:\u003c\/span\u003e Cylinder head features 64mm valves already installed, saving time and effort. Intake (18mm) and exhaust (16mm) valves offer better airflow and efficiency, perfect for performance builds, upgrades, or replacements for worn-out parts.\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;\"\u003eIncluded:\u003c\/span\u003e\u003c\/div\u003e\u003cdiv style='font-family: \"Market Sans\", Arial, sans-serif;'\u003e\u003cul\u003e\n\u003cli\u003e1x Cylinder Block\u003c\/li\u003e\n\u003cli\u003e1x Cylinder Head (with 64mm valves pre-installed)\u003c\/li\u003e\n\u003cli\u003e1x Piston\u003c\/li\u003e\n\u003cli\u003e1x Piston Pin\u003c\/li\u003e\n\u003cli\u003e2x Circlips\u003c\/li\u003e\n\u003cli\u003e5x Piston Rings (Full Set)\u003c\/li\u003e\n\u003cli\u003e5x Valve Rockers\/Rollers\u003c\/li\u003e\n\u003cli\u003e1x Cylinder Head Gasket\u003c\/li\u003e\n\u003cli\u003e1x Cylinder Base Gasket\u003c\/li\u003e\n\u003cli\u003e1x Intake Gasket\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\u003e64mm Valves\u003c\/li\u003e\n\u003cli\u003eIntake Bolt Hole Spacing: 44.75mm\u003c\/li\u003e\n\u003cli\u003eExhaust Bolt Hole Spacing: 49.75mm\u003c\/li\u003e\n\u003cli\u003eIntake Valve Diameter: 18mm\u003c\/li\u003e\n\u003cli\u003eExhaust Valve Diameter: 16mm\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;\"\u003eKnown to Fit: \u003c\/span\u003e\u003c\/div\u003e\u003cdiv style='font-family: \"Market Sans\", Arial, sans-serif;'\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\u003c\/div\u003e ","brand":"United Express Distribution","offers":[{"title":"Default Title","offer_id":53093759123567,"sku":"CYLD-0100+HEAD-1064","price":56.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/0368\/1391\/files\/CYLD-0100HEAD-1064_01.jpg?v=1778778789","url":"https:\/\/uedist.com\/products\/100cc-52-4mm-complete-cylinder-kit-with-64mm-valves-for-qmb139-qmi139-4-stroke-engines-atv-dirt-bike","provider":"United Express Distribution","version":"1.0","type":"link"}