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03 kx250 clutch vibrating??

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I recently purchased a restored kx250 and rebuilt the motor. Everything in the motor is new except for the clutch carb, and cylinder head. Everything else has less than 4 hours on it so far. I recently began hearing a vibrating noise appearing to come from the bottom end. It is more noticeable on the right side of the motorcycle and gets around 80% quieter when I pull in the clutch lever. Any ideas on what it could be?

i recorded a video Here 

 

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My kx250f does the same thing and my yz did it too so i think the noise is normal but these are 4 strokes idk if it would be different with 2 strokes. A guy on here i think,rebuilt the whole engine with oem parts and it still made the same noise.

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They do that.  You could try replacing the clutch hub, basket and all bearings but it might only reduce the noise.  No big deal though.

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