I just put stage one HottCams in my 05' 750 Brute Force. It also has a Dalton Clutch Kit, Big Gun full exhaust system, K&N Air Filter, and a Dynojet jet kit. Upon riding it after installing cams, it backfires up into the air box when I ride at a steady low throttle. I have a 150 main in the front carb & a 155 in the back. The pilot screw is backed out two turns, this is the jetting that was recomended by Dynojet. Any ideas as to what I could do to cure this thing.