I was adjusting my air mixture today, and have ran into a problem. The left carb doesn't make a noticeable change except when completely turned in. I took the plug wire off the oppisite cylinder to adjust the carb. The right side worked fine and tuned right up. What can this be?

Aaron 04 "Green Bean" Freaked, AI removal, Bafflectomy, 6" Risers, and 30" Drag Bars.