First thing I would try is tightening the carb body screws. Those one bbls had a habit of loosening up. A hundred bucks is not a cheap crap shoot. It would be pretty hard for that one bbl to be beyond repair. The carb has less then 10 moving parts so I think I'd try rebuilding it myself by closely following the instructions and seeing if there might be an online video to help. It's a very easy carb to do.