Crankshaft engine GY6 139QMB/QMA Octane

Crankshaft original quality for GY6 engines from 50cc to 90cc 4-stroke.
The GY6 engines use 2 types of crankshaft: the version with a 16-tooth gear and the more modern one with a 22-tooth gear.

Attention!!! This crankshaft uses a 16-tooth gear.

Includes the bearings already mounted.

Attention! You must carry out balancing checks before installing it in the engine, since manufacturers deny warranty for any balancing fault found after installation.