1968 Lightning, new carbs, Boyer, recent rebuild bottom end. The left side has given me problems for a while. It won't idle and there is a popping and chirping from the left exhaust. The right side it fine. I try to start using only the left plug and it won't go. The right side alone is great. I thought air leak for popping, but can't find anything wrong. Any suggestions on where to look? Thanks in Advance Steve in Ohio
I would first swap the HT leads at the spark plugs. If the problem stays on the same side, you've ruled out ignition. Then swap the carbs. If the problem stays on the same side, then you've ruled out the carbs, and you can turn your attention to the engine.
Steve, Maybe we should put our heads together. All my chirping comes from the right side. The first thing I found was that idiot former owner had mis-matched throttle slides. Warm weather has returned. I shall try all Z's suggestions.