I think I know what might be causing the clicking and ringing noise you decribed. I had the same issue. Take the cover off. Jack up the bike and spin the rear tire by hand. Watch everything turn in the transmission and pay attention to the black outer ring on the large pulley. Mine would periodically touch the edge of the clutch bell creating that ringing sound. If so, take the pulley off and grab the black ring with some vise grips. Twist it back and forth and it will pull right off. Now do it to the ring on the back side also. Problem solved! You don't need them. The tension on the belt will force it to run straight down the center of the pulley.