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GhostBikes.com£42.49Visit shop 101 Octane Bt7001-16 - Crankshaft For Sachs 49Er 50 2006-2008
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This 101 Octane replacement crankshaft is designed for 50cc and 90cc 4-stroke GY6 (139QMB / QMA) engines, providing a reliable solution for engine rebuilds. It comes fully pre-pressed with main bearings and connecting rods, making it ideal for mechanics and DIYers looking to restore factory performance. The primary caveat is the variation in oil pump drive gears; you must verify your engine's tooth count before purchase to ensure compatibility.
| Model Part Number | 756.09.23 |
|---|---|
| Brand | 101 Octane |
No, this crankshaft is specifically designed for 4-stroke GY6 (139QMB / QMA) engines only.
You must physically count the teeth on the oil pump drive gear of your existing crankshaft before purchasing.
No, this product is the crankshaft unit only, including the pre-pressed main bearings and connecting rod.
Yes, you will need a crankcase splitter and a crankcase puller/installer tool to safely remove and seat the crankshaft.
Most 139QMB engines use a 13mm pin, but always confirm your specific engine model dimensions against the part specifications.
Verify that the crankshaft spins freely in the cases before sealing the engine completely. Ensure no debris is caught in the bearings.
Double-check the tooth count of your drive gear against your oil pump gear; a mismatch will prevent the pump from engaging.
Before installation, always count the teeth on your current crankshaft's oil pump drive gear. This unit features a 16-tooth gear; if your engine requires 22 teeth, this part will not function. Installation involves splitting the engine crankcase, which should be performed using a proper crankcase puller to prevent damage to the mating surfaces. Always use a high-quality engine assembly lubricant on the main bearings and connecting rod pin during the installation process. Keep the crankshaft clean and free of rust by storing it in a dry environment until you are ready for final assembly.
