Muffler modded this adjustable carb 661 and attempted to advance the ignition. Guess I've never had a fw off a 661 cause I don't have a puller that fits. Resisted the urge to grab a big flat head and the rubber mallet, for now. The muffler mod is somewhat botched as well, never welded stainless before with this mig. Had to dress up the outside of the cover