The midrange seemed to load up somewhat but this was with a Tower carb not a perry. Are you saying that if the midrange is loading up on the Tower carb which is very similar to an OS carb that I only have to back off the hex screw at the back of the pump? Or is it that the Tower carb is uncompatable with the Perry pump? Confused but trying to understand and appreciate the feedback very much. Thanks Mike. PS: RCuniverse is a great site!