Finally got my bike running great and I pushed it backwards and the chain jumped the rear sprocket and pulled the motor back and snapped the front motor mount bolt off. See picture. Anyone have any suggestions on getting it out? The motor is still solid I was thinking just spray some WD40 and ride it until it vibrates out. Any thoughts. It seems like it is one thing after another with this motor!
Broken Motor Mount Bolt
- Thread starter kkalan
- Start date
Bikeguy Joe
Godfather of Motorized Bicycles
There was a very recent thread on this.
Use a dremel and make a slot in it like a screw and remove it.
Use a dremel and make a slot in it like a screw and remove it.
crassius
Well-Known Member
so many problems after you get the bolt out
chain should run true in both directions and never 'jump' the sprocket - needs fixing
motor should be mounted securely to the frame with no air between the two - put something in there to fill the gap (possibly motor leaned a bit to the left to throw chain off)
chain should run true in both directions and never 'jump' the sprocket - needs fixing
motor should be mounted securely to the frame with no air between the two - put something in there to fill the gap (possibly motor leaned a bit to the left to throw chain off)
Have you actually confirmed that the bolt is broken off in the case? Could it have simply fallen out? It appears that you used allen head cap screws which are usually at least a grade 8.8. Shearing one would have taken some work.
Also what is the engine mount where it attaches to the frame made of? If that is rubber, it's why your engine moves and vibrates bad enough for fasteners to fail. The engine should be mounted solid to the frame with no resilient material between the parts of the mount.
I also agree that your chain/sprocket alignment is off. The chain should travel smoothly without binding no matter which direction you roll the bike.
Tom
Also what is the engine mount where it attaches to the frame made of? If that is rubber, it's why your engine moves and vibrates bad enough for fasteners to fail. The engine should be mounted solid to the frame with no resilient material between the parts of the mount.
I also agree that your chain/sprocket alignment is off. The chain should travel smoothly without binding no matter which direction you roll the bike.
Tom