I have a noise at idle on a 600 Grizzly,when you remove the belt the noise goes away until you put pressure on the primary clutch.The belt is pulling on the clutch causing the noise.There is slight play in the bearing is this alone causing the sprag cltch to make the noise or do sprag clutchs develop wear.thankyou.

 

Sounds like the one way bearing (sprag) is dragging or one of the springs on the centrifigal clutch is broken. Dealer time.