If the carb has 6.5 p/v in the prim. and sec. and you change them to 4.5 what would that do ? Release fuel sooner or later depending on vacuum or the amount of fuel that is released is more or less ? My goal here is to consume fuel when cruising around at 3000-3500 rpm, but have enough at w.o.t . I know, make a pass and read your plug....but I'm trying to understand how it works. Thanks