{"product_id":"for-gy6-49cc-50cc-139qmb-scooter-moped-atv-sunl-starter-clutch-gear-us","title":"For GY6 49cc 50cc 139QMB Scooter Moped ATV Sunl Starter Clutch Gear US","description":"\u003ch2\u003eStarter Clutch Gear for GY6 49cc 50cc 139QMB Scooter Moped ATV Sunl\u003c\/h2\u003e\u003cp\u003eThis starter clutch gear is a one-way drive component that couples the electric starter to the crankshaft on 4-stroke GY6 139QMB engines, so the starter can crank the engine and then release once it fires.\u003c\/p\u003e\u003ch4\u003eOverview\u003c\/h4\u003e\u003cp\u003eThis starter clutch gear is made for 4-stroke GY6 49cc and 50cc engines used in scooters, mopeds, and ATVs, including Sunl models. It transmits starter torque to the crank during starting and disengages afterward to protect the starter. A practical replacement for a worn or slipping starter clutch gear in a 139QMB build.\u003c\/p\u003e\u003ch4\u003eBuilt For Performance\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eOne-way sprag clutch engages during starting and releases once the engine runs\u003c\/li\u003e\n\u003cli\u003eGear teeth cut to mesh with the GY6 139QMB starter reduction drive\u003c\/li\u003e\n\u003cli\u003eHardened wear surfaces for long service life across many start cycles\u003c\/li\u003e\n\u003cli\u003eDirect-fit replacement for the stock starter clutch gear on 49cc and 50cc GY6 engines\u003c\/li\u003e\n\u003cli\u003eMounts on the crankshaft end behind the variator or flywheel\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFits These Machines\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003efor GY6 49cc 4-stroke scooters\u003c\/li\u003e\n\u003cli\u003efor GY6 50cc 4-stroke scooters\u003c\/li\u003e\n\u003cli\u003efor 139QMB equipped mopeds\u003c\/li\u003e\n\u003cli\u003efor 139QMB equipped ATVs\u003c\/li\u003e\n\u003cli\u003efor Sunl 49cc and 50cc GY6 models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eOn-The-Job Use\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eReplacing a starter clutch gear that slips, grinds, or will not turn the engine\u003c\/li\u003e\n\u003cli\u003eRebuilding GY6 139QMB engines in scooters and mopeds\u003c\/li\u003e\n\u003cli\u003eServicing ATVs and Sunl models that run the 49cc and 50cc GY6 engine\u003c\/li\u003e\n\u003cli\u003eShop repairs when the starter spins but the engine does not crank\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecs At A Glance\u003c\/h4\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4-stroke GY6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplacement\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e49cc \/ 50cc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine Code\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e139QMB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eComponent\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStarter clutch gear\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTransfers starter torque to crank and releases when running\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 What are the signs of a bad starter clutch gear? \u003cstrong\u003eA:\u003c\/strong\u003e A whirring or grinding noise at start-up, the starter spinning without cranking the engine, or loss of grip under load are the usual symptoms.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Will this fit a Sunl scooter or ATV with a 139QMB engine? \u003cstrong\u003eA:\u003c\/strong\u003e Yes, this starter clutch gear is intended for 4-stroke GY6 139QMB engines in the 49cc and 50cc class, so confirm your engine code and model before ordering.\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":50553934610518,"sku":"ZZ3M01659","price":27.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0697\/8460\/0662\/files\/s-l1600_f24bf69c-e3a1-4ada-8c5d-128511985087.jpg?v=1790802934","url":"https:\/\/www.solidspare.com\/products\/for-gy6-49cc-50cc-139qmb-scooter-moped-atv-sunl-starter-clutch-gear-us","provider":"Solid Spare","version":"1.0","type":"link"}