Sunny Carburetor Automatic Choke GY6 125CC 152QMI 157QMJ Scooter Moped Parts Universal Auto Choke for 139QMB & GY6 150CC Carburetors, fits all models. KF, Walbro, KeiHin etc... 71MM from top of choke to end of needle and 20MM diameter insert section. #3 on Diagram - Electric Choke Assembly for 50cc 4-stroke QMB139 engines. (Also fits carburetors on 150cc and 125cc GY6 4-stroke engines)