Bicycle Motor Squealing

Hey,

Ive been doing quite a bit of lurking and searching and have an idea of what my problem might be but figured Id pick your brains. Anyway, I stopped riding the bike for a while because of this squealing noise that sounds like it is coming from the motor.

After some searching I narrowed it down to either the clutch or the main bearing within the motor. I adjusted the clutch as per some directions that came with the motor. The clutch works a bit better now but there was never anything wrong with it.

The squealing comes regardless if the clutch is engaged or not. Its harder to hear when the motor is engaged because it is running. It does not seem to vary with rpm but is intermittent.

Is the main bearing or bushing shot? I bought the motor from King Motor Sport and have almost 20 hours on it. I am quite capable of tearing down the motor, but have not had time to do it until today. Its been some time since its been ran. If I tear it apart what should I be looking for? Can I purchase the bearing anywhere like say tractor supply or Napa or something of the sort?

Any suggestions will be greatly appreciated.

Well I have the clutch plate removed. After reading another thread about the teeth chipping I figured Id test for that. Yes it was chipping so I used the dremel and made some more clearance. I have not put the cover back on, went for a wheel down the driveway and it is still squealing. No cover so its not chirping any more but this is a constant squeal that happens every time the wheel turns. It seems to be coming from the shaft where the chain mates to the clutch, though I cant really get in there to check it out.

Any ideas?

So it's not the clutch pucks slipping on the clutch disk??

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No, Ive adjusted the clutch several times. Right now it sits with out the cover to the clutch or the pressure plate attached and it still squeals. Of course the motor isnt running, this is just wheeling around the driveway

OK - If it does it while just sitting still or with wheel propped and turning, I suggest a mechanic's stethascope.

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Looking at Norman's engine tear down thread, i think behind this is my issue.
bicycle engine total tear down

If I am right its something along this shaft.
bicycle engine total tear down

I haven't tried it with the wheel propped in a stand but wheeling around the driveway yes. And no if the motor is running and its sitting there with the clutch engaged theres no squealing.

Pretty simple to pull the chain gear, the small shaft and the single ball bearing. Pull that stuff out, inspect - lube the heck out of the stuff and reassemble. If that doesn't work then go in deeper.

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by your description you have a main shaft bearing going bad follow my tear down to get to the bearings they are both the same and metal shielded on one side you should be able to cross ref. the numbers to get replacements the ones in there now are cheap very cheap that's why you hear the cheap, cheap, noise.. I used a plastic hammer to tap them and the shaft out it will come out from either side just don't beat it hard. Don't take the bearing on the clutch apart like I did unless you want to play pick up cause those little bastards I mean balls will scatter to the four winds and then some. You can lube them with a light grease with a needle or machine oil. As for the bearings clean out the old grease and pack the cavity with a good grease the clutch mounting stud when pulled out makes for a easy way to grease the bearing. you might try that first but if the thing is crying it will be faster and easier to take apart and fix it. Good luck and have fun

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So - it makes no noise while idling and reving...Norm you mean main "drive" shaft (after the clutch), right?

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