Squealing motor

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Squealing motor


Post by squealer » Sat May 28, 2005 9:52 am

Having trouble when my bike first starts there is a high pitch squealing cant tell where it is comong from, oil is pumping threw the lines, does it sound like a cam bearing?

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Re: Squealing motor


Post by Cotten » Sat May 28, 2005 1:23 pm

You haven't told us what year it is. Bushings squeal easier than the later needle bearings, which usually just frag.
Sounds telegraph throughout a motor, making them hard to pinpoint.
Eliminate the most likely variable by removing the generator and see if the squeal has disappeared. You need only to loosen it's mounts and pull it out far enough to fully disengage the gear.

The circuitbreaker is harder to test, but a squirt of penetrant oil beneath the cam lobe may give a positive result, and maybe even cure it.

Beyond that, you may have to look inside. Pulling the tappet blocks and inspecting the rollers would be wise, and the cam endplay or any obvious damage can be observed through the holes.
You may even be able to detect radial play in the bushing(s) or bearing.
Then you would be popping off the cam cover anyway.

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