i thought of that as well. but i had a hell of a time getting the screws (wtf? screws!) off to remove the carb. before i started they were immaculate and even the thread loc-tight was still on there, so i really think the carb was never removed. how would you go about cleaning out the muffler? i also just remembered that the tail pipe was pinched almost shut (as if someone ran over a log or something) so possibly the muffler is clogged somewhat. i of course tried the cleanout hole and fixed the tail pipe. i remember you dicking around with pa50 exhausts.