Carburetor for 4 Stroke GY6 49cc 50cc Chinese Scooter Moped Taotao Kymco Inner Diameter (intake): 19mm Outer Diameter (air filter mount): 40mm Electric Choke (plug style): 2-pin, male plug Main Jet Size: #80 / Idle Jet Size: #35 GY6 50CC carburetor for 4 stroke QMB139 engine.