08 yz450f making clutch chatter sounds

My 08 450 just start making a chattering noise when the clutch is engaged. No sound besides the motor when it is disengaged. So far I've pulled down to the plates. All plates are in tact. No broken bolts or anything. Basket has slight notching but isn't too bad. What could this be? Clutch bearing wearing out possibly?

That sounds like a loose timing chain...

That sounds like a loose timing chain...

I would agree with you if it was a constant sound. But it only makes this sound when the clutch is engaged. When it is disengaged, the motor sounds completely normal.

All WR's make a disconcerting sound when the clutch is engaged. 

Kind of a low rumble and metal sound.

 

NORMAL

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