Hi i have a 2002 blaster with a fmf racing exhaust and a larger mikuni carb, recently while i was drag racing, I noticed that my bike has a flat spot in 3rd and 4rth gear. What i mean by this is that as i change into one of those gears my bike has absolutly no power and it sounds like its just sucking in air. it then refuses to accelerate and i have to release my throttle before accelerating again. What might be the cause of this problem?