On the SuperTigre, the direction of the orifice on the main needle is adjustable, and it needs to point absolutely straight down the throat of the carb to make it work properly. I had a 45 that wouldn't run right, and found that when I adjusted the main jet to discharge straight down the throat, it would run fine.

If I had re-read the post, I would have found that he had already swapped the entire carb.... sorry..