Quote Originally Posted by Reptile View Post
Putting pressure on any pulley system like that can put added stress on bearings. Is the clunking a loose "catching" feeling like when the coupler wears out? I don't see a tight belt doing any harm any farther down in the blower. I'd just guess at the snout end.

You may want to check your oil for shavings or something.
you hit the nail right on the head!