if you mean you cannot get it to go to full throttle off idle, there isnt any way to fix that. It is a big carb and it is a pumper so you have to give it a little loud pedal in order to get it to rev off of idle.
Thanks for the reply edgerat. Maybe I didn't explain it correctly though. Say you're cruising in 2nd, 3rd or even 4th at low RPM's, not lugging the motor though, and you hit the throttle wide open. It hesitates badly and sometime it will kill the motor. Thanks again. I hope to meet Brit Mansell out at Bremen tonight, maybe he can help.