Looks like a d & d pipe on it ,, is it a full system or just a slip on ? if a full system you'll need a jet kit and a timming advancer would'nt hurt either ,,, but if it's had the problem since day one ,,, you should've taken it back to the dealer a.s.a.p. and let them deal with it before your manufacturer waranty was expired, a dirty air filter, valve adjustment are also possible cures in addition to the jet kit. float highth in the carbs , jet size and needle highth will all change and improve your over all peformance...if it's done had all that ,, it was installed wrong ,, get it on a dyno to tune it correctly with the air/ fuel ratio at 12.5 - 13.5....good luck.
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