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Hi new here, i just installed bbk on my keeway 2 stroke everything seems good spark plug is light brown, starts good, good compression, take off and acceleration is great top end is good to, the problem i am having is when i hit some bigger hills the rpms drop way down and the speed to, it also does the occasionally when i let off the throttle and hit it again, i tried a heavier torque spring and it helped a little but not much, is it possible that the clutch is the culprit and the sheave is not closing when it should or should i be checking for something else? Thanks