{"product_id":"47mm-big-bore-cylinder-kit-with-piston-rings-gaskets-for-139qmb-qmb139-qmi139-4-stroke-gy6-50cc-scooters-80cc-100cc","title":"47mm Big Bore Cylinder Kit with Piston Rings Gaskets for 139QMB QMB139 QMI139 4-Stroke GY6 50cc Scooters 80cc 100cc","description":"\u003cdiv style='font-family: \"Market Sans\", Arial, sans-serif;'\u003eUpgrade your scooter's engine power and efficiency with the \u003cspan style=\"font-weight: bold;\"\u003eRedCap 47mm Big Bore Cylinder Head and Piston Rings Rebuild Kit,\u003c\/span\u003e specifically engineered for GY6\/QMB139 4-stroke engines. Designed to replace or enhance your existing 50cc or 60cc setup, this kit increases your engine displacement to approximately 80cc, delivering noticeable improvements in acceleration, throttle response, and fuel combustion. The kit includes a precision-machined aluminum alloy cylinder block, piston, complete ring set, wrist pin, circlips, and a comprehensive gasket set for a smooth and hassle-free installation. Whether you're rebuilding a worn-out engine or upgrading for extra power, this high-quality kit ensures long-term performance and reliability.\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;'\u003eThis big-bore kit is compatible with a wide variety of Chinese scooters, mopeds, ATVs, and go-karts, including popular brands like TaoTao, Roketa, Sunl, SYM, PGO, KYMCO, Vento, Jonway, Strada, Kazuma, and many others using the GY6 50cc-80cc engine platform (139QMB\/QMI). Designed to meet or exceed OEM specifications, this kit integrates easily with stock carburetors and engine components, offering a plug-and-play upgrade for most users. For optimal performance, it's recommended to tune your carburetor with larger jets and monitor the spark plug during initial runs. Whether you're commuting or off-roading, this kit boosts your scooter’s power and performance without compromising fuel efficiency or engine longevity.\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\u003eEngineered with precision to ensure a snug and secure fit for GY6\/QMB139 engines. The 47mm cylinder provides increased power without compromising structural integrity, delivering smoother operation, better acceleration, and improved combustion. A reliable upgrade for restoring or boosting your engine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eWide Compatibility: \u003c\/span\u003eDesigned for a wide range of Chinese scooters, mopeds, ATVs, and go-karts, the RedCap Big Bore Kit fits most 4-stroke GY6 or 139QMB engine models from 50cc to 80cc. Compatible with brands like YERFDOG, SUNL, SYM, PGO, KYMCO, VENTO, STRADA, ROKETA, and more, ensuring versatility for countless vehicle types.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eEngine Upgrade:\u003c\/span\u003e Boost your scooter or moped's power and efficiency with the RedCap 47mm Big Bore Kit. Designed for 50cc to 80cc 4-stroke GY6\/QMB139 engines, this kit increases engine displacement, delivering better throttle response, smoother operation, and more horsepower for everyday riding or performance upgrades.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eDurable Construction: \u003c\/span\u003eCrafted from premium-grade aluminum alloy, this rebuild kit offers exceptional durability, heat resistance, and wear tolerance. Each component is precision-machined to meet or exceed OEM standards, providing long-lasting reliability and enhanced engine life, even in demanding riding conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eEasy Installation: \u003c\/span\u003eCylinder block, piston, ring set, circlips, piston pin, and gaskets. The user-friendly design ensures a smooth installation process, whether you're a DIY mechanic or a professional. Works seamlessly with stock carburetors for instant performance gains.\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\u003cli\u003e\n\u003cspan style=\"font-weight: bold;\"\u003eCylinder Bore Size:\u003c\/span\u003e 47mm\u003c\/li\u003e\u003c\/ul\u003e\u003c\/div\u003e\u003cdiv style='font-family: \"Market Sans\", Arial, sans-serif;'\u003e\u003cspan style=\"font-weight: bold;\"\u003eIncludes:\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 Piston.\u003c\/li\u003e\n\u003cli\u003e1x Complete Ring Set.\u003c\/li\u003e\n\u003cli\u003e2x Cirq clips.\u003c\/li\u003e\n\u003cli\u003e1x Piston Pin.\u003c\/li\u003e\n\u003cli\u003e2x Head Gasket Set.\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\u003cli\u003eFits many models such as YERFDOG, SUNL, SYM, PGO, KYMCO, VENTO, STRADA, ROKETA, FUJI, WILDFIRE, KAZUMA 80cc Big Bore Kit. This kit fits most Chinese Scooters\/Mopeds with 50cc, 60cc 4-Stroke GY6\/QMB139 engines.\u003c\/li\u003e\u003c\/ul\u003e\u003c\/div\u003e ","brand":"United Express Distribution","offers":[{"title":"Default Title","offer_id":53093622022255,"sku":"CYLD-0079","price":39.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/0368\/1391\/files\/cyld-0079_01.jpg?v=1778775106","url":"https:\/\/uedist.com\/products\/47mm-big-bore-cylinder-kit-with-piston-rings-gaskets-for-139qmb-qmb139-qmi139-4-stroke-gy6-50cc-scooters-80cc-100cc","provider":"United Express Distribution","version":"1.0","type":"link"}