{"product_id":"cvt-drive-belt-729-17-7-30-for-4-stroke-gy6-49cc-50cc-139qmb-1p39qmb-long-case","title":"CVT Drive Belt 729-17.7-30 for 4 Stroke GY6 49cc 50cc 139QMB 1P39QMB Long Case","description":"\u003ch2\u003eCVT Drive Belt 729-17.7-30 for 4 Stroke GY6 49cc 50cc 139QMB 1P39QMB Long Case\u003c\/h2\u003e\u003cp\u003eThis CVT Drive Belt 729-17.7-30 is a replacement drive belt designed for 4 Stroke GY6 49cc and 50cc engines, transmitting power from the variator to the clutch for smooth acceleration. It fits Long Case applications and is a direct cross-reference for engines using the 139QMB and 1P39QMB platforms.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis CVT Drive Belt 729-17.7-30 is a high-strength replacement belt built for 4 Stroke GY6 49cc and 50cc scooter engines. It transfers engine power through the continuously variable transmission, ensuring dependable speed and torque. This CVT Drive Belt is designed for Long Case configurations common on 139QMB and 1P39QMB engines.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePrecision-cut width of 17.7 mm for consistent grip on variator and clutch faces\u003c\/li\u003e\n\u003cli\u003eReinforced rubber compound resists heat and wear during sustained operation\u003c\/li\u003e\n\u003cli\u003e33.5 mm effective length matches OEM specifications for 729-17.7-30 sizing\u003c\/li\u003e\n\u003cli\u003eFlexible construction reduces vibration and delivers smooth power transfer\u003c\/li\u003e\n\u003cli\u003eTested for compatibility with Long Case CVT housings\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor 139QMB\u003c\/li\u003e\n\u003cli\u003efor 1P39QMB\u003c\/li\u003e\n\u003cli\u003efor 4 Stroke GY6 49cc\u003c\/li\u003e\n\u003cli\u003efor 4 Stroke GY6 50cc\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eReplaces worn belts on 49cc and 50cc scooters with Long Case CVT assemblies\u003c\/li\u003e\n\u003cli\u003eSuitable for daily commuting and light-duty urban riding\u003c\/li\u003e\n\u003cli\u003eWorks in variator-driven transmissions requiring 729-17.7-30 dimensions\u003c\/li\u003e\n\u003cli\u003eIdeal for maintenance rebuilds of GY6 engine platforms\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e729-17.7-30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBelt Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e729 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBelt Width\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e17.7 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBelt Angle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30 degrees\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 Stroke GY6 49cc \/ 50cc Long Case\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch4\u003eGood To Know\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e How do I know this CVT Drive Belt fits my scooter? \u003cstrong\u003eA:\u003c\/strong\u003e Check the belt dimensions (729 mm length, 17.7 mm width) against your existing belt, and confirm your engine is a 139QMB or 1P39QMB with a Long Case housing. Most GY6 49cc\/50cc scooters with this case type will accept this belt.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What happens if I install a belt with the wrong width? \u003cstrong\u003eA:\u003c\/strong\u003e A belt that is too wide or narrow can cause slippage, poor acceleration, or premature wear on the variator and clutch faces. Always match the 17.7 mm width to your specific CVT components.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eSlight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Solid Spare","offers":[{"title":"Default Title","offer_id":45562504511574,"sku":"ZZ3F00291","price":28.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_37fc80a3-4ce0-40e7-a0c6-f6271c32d102.jpg?v=1789235969","url":"https:\/\/www.solidspare.com\/products\/cvt-drive-belt-729-17-7-30-for-4-stroke-gy6-49cc-50cc-139qmb-1p39qmb-long-case","provider":"Solid Spare","version":"1.0","type":"link"}