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backfire carb rpm lag

  1. Started to backfire at cruise speed...?

    VTX 1300 Riders Board
    I dont know what caused it but yesterday she started to backfire at cruise (3rd gear at 40mph, 4th at 50mph and 5th at 60mph). It only happens at those speeds. Backstory/ setup: 1300c w/ BAK and bub's exhaust, factory pro jet kit 205 with needle tit clipped but cant remember the position, A/F...