Description OEM quality crankshaft for 50/90cc 4-stroke engines (GY6 50, 139QMB/QMA). The crankshaft is pre-pressed with top quality main bearings.GY6 engines are factory-fitted with 2 different crankshaft models. The difference is in the oil pump drive gear on the right side. Most models are equipped with the older version with 16 teeth. The newer version has 22 teeth and is used for Rex and some other models. If you're not 100% sure, just count the number of teeth on your cog. Questions about the product

• Brand: Standard Parts
• SKU: BT7001-16
• Availability: In stock

Notes and Safety 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