03 banshee with porting and cpi pipes......at an idle the bike runs great, starts on the first or second kick...when i go to about 1/4 throttle and keep it there, such as going down the dune access roads, the left cylinder loads up and quits firing. when i open the throttle up past 3/4 it clears out and hits on both cylinders and takes off. i pulled off the left carb and cleaned it out, no change, it just keeps dropping the left side on partial throttle....any help would be great.
thanks