This is a new bike to me this spring but I still don't have 30 miles on it. The problem is just that, starts fine, runs good cold, but after 5 minutes one cylinder starts becoming intermittent. A timing light narrowed it down to the rear cylinder spark becoming flakey. I've already replaced the coils, ignition wires and caps. Timing is spot on, gas is good. I did find one of the hoses off on the gas tank, an air bleeder but it made no difference. Also found one of the coil's two slip on terminals were reverse wired, made no difference. Also found a mouse made a nest in the air cleaner, a new one made no difference and I added a wire mesh to the air box intake. Any ideas?
