Description
Crankshaft GY6 4-stroke
Crankshaft OEM quality GY6 (4-stroke) 139QMA / 139QMB with 22 teeth, low-priced replacement crankshaft for your old/damaged/worn one. The crankshaft ist pre-pressed and comes with main bearings and connecting rod.
Features GY6 crankshaft
This is the GY6 crankshaft with 16 teeth pinion.
Two different versions are already factory-fitted in the GY6 engines. The only difference is the drive gear for the oil pump on the right-hand side. The old crankshaft version with 16 teeth used in almost all scooters has a gear with 16 teeth. The newer crankshaft version with 22 teeth is used, for example, on new Rex models.
To be on the safe side, please recount the teeth of the gearwheel for the oil pump drive.
How to change a crankshaft?
The crankshaft is one of the main components of the engine and is responsible for the smooth operation of motorcycle, scooter and moped, whether with two-stroke or four-stroke engine. The longevity of the engine depends not only on the proper condition of the crankshaft, but also on the fact that it is properly mounted.
For a correct installation of the crankshaft, we recommend our tutorial: Crankshaft disassembly and assembly.
How can I tell if my crankshaft is Damaged?
A broken crankshaft causes metallic noises, unusual vibrations, leaking oil seals and drastically reduces the performance of the two-wheeler. In any case, the vehicle must be stopped immediately to prevent the damage from getting worse.
Please note that whenever the crankshaft is changed and serviced, you'll have to install new crankshaft bearings.
Tuning Level: Original
We categorize our products into different performance levels Original, Sport, Racing and High End , so that our customers can choose the right parts for their setup. It is really important to combine parts that belong to the same tuning level, this is especially true for cylinders, crankshafts and exhausts.
Under Original you will find parts whose performance and technical specifications are identical to those of the stock part.
