Well my left cyl won't fire at idle. Pipe gets warm but not as warm as the right side. It used to idle fine and about 15 minutes into a ride it wouldn't idle on its own and the left wouldn't fire until I gave it some good throttle. Pulls fine in the powerband and on the top end is all there. I've cleaned the carbs, made sure there were no air leaks and the reeds looked fine. I also tried new plugs and swapped plug wires. Problem is still there. Any ideas?