I've had my Roso Corsa back under warranty and the TB's balanced etc. It still misfires with a loud bang....only occassionally below 3K or under even throttle. So noone is alone, but if someone, anyone, comes up with an answer, please let me know. Other than that....I luuuuuuuuuuvvvve this bike and the gobs of torque it delivers so willingly.