i found that on the motors i have run with the jp3 &4 i have had to run the bottom a lot leaner than i like to stop them from loading up, esp with the 3
it hasen't seemed to be as bad when the motors are fresh but when they get a few litres on them i start to get the problem . but a lot of people seem to like them,maybe its just me but i dont seem to get the same prob with te other pipes i ave run