Crankshaft 101 OCTANE 16-tooth oil pump drive sprocket 139QMB/QMA

Original-quality aftermarket crankshaft for 50/90cc 4-stroke engines (GY6 50, 139QMB/QMA). The crankshaft is pre-pressed with main bearings and connecting rod. GY6 engines are factory-fitted with two different crankshaft versions. The only difference is the oil pump drive gear on the right-hand side. The older version, installed in almost all vehicles, has a 16-tooth gear. The newer version has 22 teeth and is used in, for example, Rex models. For added assurance, count the number of teeth on your gear and compare it with the provided image.

16 tooth oil pump driven sprocket for 139QMB/QMA