Hi, I have a '69 CL350. Starts and runs great, hot or cold. The ONLY problem is that after running a while and coming to a stop, the idle will sometimes be lower than before, maybe down to 800 from the initial 1100. A blip of throttle brings it up momentarily but otherwise it will just go lower and almost die. Only seems to do this after it is pretty hot. Don't notice it so much on a long night ride for example. I have seen many questions about this problem but never a definite cause. Compression is around 160 both sides. Timing and point gap correct. Valves set accurately to .002 and .004. Carbs clean and rebuilt a few hundred miles ago with stock jetting and new diaphragms. Carbs synced by setting both idle screws just at the stops, then turning each in equally to 1100 RPM. Cables adjusted so both butterflies start opening simultaneously. No vacuum leaks. Advancer working smoothly. Spark plugs read clean and almost white with a nice black ring around the base of the insulator. Bike never needs choke hot or cold, but always starts right away. If I use the choke at all the bike dies. I think that's everything. Like I said, the bike starts and runs perfect, just the hot idle thing has got me stumped. Any ideas I might have missed?
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