White Brothers Aluminum Pro Full System Stock jetting is a 160 and I put a 162 in. For the pilot stock is 45 I put a 48 in. Still backfires......even when I twist the throttle. Also Deacceleration backfiring. When it's doing this I would believe it's lean....but correct me if im wrong. What jetting would you guys use? Please and thank you I want to tear it up!