More air bigger jets!Ha!mine didn't realy come to life untill next rs around 55mph with the next r and jets.Now cranks to about an inch past 50 mark and has more'needle can't go any further,still breaking in will cruise at the 50 mark once there at little over 1/4 throttle.The od. is a bit generious about 3 mph.Take off isn't great(stock ver.)30 to 60+ insane.