Loud screeching noise; weird

GoldenMotor.com

kojak

New Member
Feb 2, 2011
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92591
My motor has started making a very loud squealing noise as soon as the piston begins to move. It goes away once the motor is up to speed and is less noticeable but still there once it warms up completely. My clutch is not slipping or rubbing the cover. It sounds no different with the cover off, or with the clutch engaged or disengaged, it's only related to motor speed. It's at its loudest when the motor is being turned by the bike just before it fires up. Help!
 

2door

Moderator
Staff member
Sep 15, 2008
16,302
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Littleton, Colorado
Hve you lubricated the gears on the right side of the engine? It only takes a dap of a good quality bearing grease. Don't go overboard or the grease will find its way onto the clutch friction surfaces.
Tom
 

kojak

New Member
Feb 2, 2011
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92591
I was advised by the builder to keep those gears lubed. I'm not describing the racket it's making very well but it's not a constant noise like a gear grinding; it pulses with the engine.

I did notice that the clutch pucks are pretty shiny on the inside surface, but the clutch still works fairly well. The squeaking/squealing is loudest at low engine speed whether the clutch is in or out.
 

Goat Herder

Gutter Rider
Apr 28, 2008
6,237
20
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N.M.
How about greasing the clutch and ball for the cable driven clutch side on the left side of the motor. Those will make all kinds of weird noises when they are dry.
 

bairdco

a guy who makes cool bikes
Aug 18, 2009
6,537
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living the dream in southern california
i was about to post the same thing. mine made a heck of a racket until i greased that ball. but only when rolling with the clutch pulled in, not all the time.

here's a tip to get that ball out. none of mine seem to just roll out when the bike's tilted, so i stick a strong magnet onto a screwdriver, and the ball sticks to the screwdriver so you can pull it out.
 

kojak

New Member
Feb 2, 2011
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92591
I greased that actuator too while I had the bike apart for paint, thanks to lurking on this forum. Didn't pull the ball out though, just shot a dab of dry teflon in the hole.
 

LS614

Active Member
Dec 22, 2009
1,236
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CT and MA
Well, it seems like you probably have demons in your engine that are unleashing the screams of the damned. Not really though, I know what you mean by screeching I think, I have a two stroke that screeches as the piston goes up and down in the cylinder. This engine is not hooked up to anything currently and screeches when I turn the shaft. I suspect for my engine it is a matter of not being lubricated because it is not running. Yours is running, but you may not be getting enough lubrication. What is the ration you are running and what kind of oil are you using? Good luck and I hope you can figure it out :) You may want to take your exhaust off and your spark plug and shine a light through the plug hole when your piston is all the way down. You might have scuffing and gouging.
 

kojak

New Member
Feb 2, 2011
60
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92591
Sure; I'm a little embarrased that it took me this long to figure it out but it really sounded like a bearing or someything. I was tinkering with it in my back yard and took it for a quick spin aound the block wearing shorts, and right away I felt the hot air on my leg.

It's running like a champ now, and the power's back too.