Thanks for the replies! I don't believe that the clunk is stuck in the front of the tank as I have completely replaced all plumbing and tank trying to solve the problem. The baffle in the muffler has not been removed-- the muffler has never been taken apart-- maybe the baffle was never there...? I have been thinking about installing one of those dubro exhaust deflectors to try and increase the back-pressure. I have not torn the thing apart yet. Do I take the carb apart? Or do I just take it off and try to clean it out really well?

Thanks--