Yes Ron I got the other carb. It does it also. But ive done alot of playing around and think I have it narrowed down. First off im running the JR 9100s in my Losi. Have to use the 1/4 inch spacer to keep it from banging on the pan. Lifts it pretty high. Now since Im not having the prob with the 2010 Ive kinda come to the conclusion that really the only 2 differences in the carbs are the material there made of and the o-ring on the 2010 carb. So I think the next time I run the comp. carb im going to run a o-ring at the base. My thoughts being that if it is raising the carb just enough to get a better alighnment, that could possibly stop the binding. The other thing I noticed, is it only hung up when it was warm. When cold no hanging up at all. Alls I know is you have been more than helpful in this matter and you have a customer for ever. For that matter I just got my buddie to buy a B5 last night. The other thing that is cool is that when one of the experts come up to you and say you got more speed than anybody on the track, you just have to learn how to control it now. makes you feel pretty good .... Buy the way he runs a b5 too. Thanks again Ron