{"product_id":"belt-729-17-5-30-fit-gy6-49cc-50cc-139qmb-139qma-engine-long-case-go-kart-atv","title":"Belt 729-17.5-30 Fit GY6 49cc 50cc 139QMB 139QMA Engine Long Case Go Kart ATV","description":"\u003ch2\u003eBelt 729-17.5-30 for GY6 49cc 50cc 139QMB 139QMA Engine Long Case\u003c\/h2\u003e\u003cp\u003eThis belt 729-17.5-30 is a drive belt for GY6 49cc and 50cc engines, including the 139QMB and 139QMA long case variants, used in go karts and ATVs.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis belt 729-17.5-30 is a replacement drive belt for the GY6 49cc 50cc engine family, including 139QMB and 139QMA long case units. It transfers power from the engine to the CVT, enabling movement in go karts and ATVs. The belt measures 729mm in circumference and 17.5mm in width, with a 30-degree angle, matching the standard dimensions for these engines.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eConstructed from durable rubber compound for long service life\u003c\/li\u003e\n\u003cli\u003eDesigned to handle the torque output of GY6 49cc and 50cc engines\u003c\/li\u003e\n\u003cli\u003ePrecise 17.5mm width ensures proper CVT engagement\u003c\/li\u003e\n\u003cli\u003eReinforced tensile cords minimize stretch and slippage\u003c\/li\u003e\n\u003cli\u003eEngineered for the long case CVT housing used on 139QMB and 139QMA engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor GY6 139QMB engine long case go karts\u003c\/li\u003e\n\u003cli\u003efor GY6 139QMA engine long case ATVs\u003c\/li\u003e\n\u003cli\u003efor 49cc 50cc GY6 engine scooters with long case\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eReplaces worn or broken drive belts during routine CVT maintenance\u003c\/li\u003e\n\u003cli\u003eUsed in go karts to transfer engine power to the rear axle\u003c\/li\u003e\n\u003cli\u003eUsed in ATVs for recreational off-road riding\u003c\/li\u003e\n\u003cli\u003eSuitable for utility vehicles powered by GY6 49cc 50cc engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\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\u003e17.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAngle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30 degrees\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number(s)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e729-17.5-30\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 belt fits my engine? \u003cstrong\u003eA:\u003c\/strong\u003e This belt is specifically sized for the GY6 49cc 50cc long case engines with part numbers 139QMB and 139QMA. Confirm your engine's CVT case style and belt dimensions before installing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What happens if the belt is the wrong width? \u003cstrong\u003eA:\u003c\/strong\u003e An incorrect width can cause poor acceleration, slippage, or premature wear. This 17.5mm width matches the OEM specification for these engines.\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":45562518929494,"sku":"ZZ3F00434","price":29.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_ea468d4e-c353-4e33-a2a0-454916d43cf5.jpg?v=1789236661","url":"https:\/\/www.solidspare.com\/products\/belt-729-17-5-30-fit-gy6-49cc-50cc-139qmb-139qma-engine-long-case-go-kart-atv","provider":"Solid Spare","version":"1.0","type":"link"}