My '95 Badboy has gotten to where when I'm cruising at 45mph in 5th gear, it wants to jerk and pop [seems popping through tail pipes]. I can pull choke out about a third of the way, and bike runs better, except when I come to a stop, then it is idling too high. Both plugs have been fouling, but mostly rear cylinder plug. It is not gas or oil fouled. It is a dry black sooty foul with no smell [gas or oil]. A while back, a mechanic adjusted [I think, the needle...he said it had a clip on it and he raised clip up a notch...]. It seems to me that the bike is starving for gas, and possibly needs this clip put back to where it was, at least. Am I thinking right here, or is there something else I should check for. All help and info is greatly appreciated ! !