I had the same problem Fastsky describes right from the beginning with a ST G-45. I tried honing the barrel with emery cloth with only limited success. I think if I had a solid throttle pushrod or a nyrod instead of a cable, it would have been OK. Otherwise, I liked the engine. It was just starting to get nicely broken in when I pulled back rather than forward in a low level inverted pass. The carb's in a few pieces now.

-Scott