i've got a 4 mill cub with 34pj's on gas. i've got 60 pilots, cel middle position, and 160 mains. it sems to run perfect untill i get in the powerband, then it cuts out really bad. i've changed out the plugs, cdi, coil, and stator. nothing seams to help. my jetting is a little rich compared to what others on here are running, but the bike is acting like it is lean on top. anybody know what the problem may be?