I have a 46 and 61. Had no problems with the 61 but the 46 kept stumbling or dead sticking on me. Took the muffler apart and found the drain hole on the baffle was upside down. Re installed it and it didn't dead stick any more but kept stumbling. Finally took out the baffle completely and problem solved. I also took the baffle out of my 61 just because, and it transitions like a dream even after extended idles

flynte