When I go slow (5-15mph) and give light to medium throttle, my ped 4 strokes (or atleast sounds like it) . But its fine at full throttle. From what I read normal 4 stroking is at WOT. So I don't know if this is considered truely 4 stroking or not. Basically what I want to know is: does this mean I need to down jet?? Low end is feeling weak too, and it stalls at idle sometimes.