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Did you try backing the idle mixture screw out a little, like 1/8th to 1/4 turn? Any change?
Yes I tinkered with the carb adjustments and went back to the original
42 main jet today. Bike runs like a rocket over 2k rpm.
Carb problems would not make only 1 cyl miss.?
Does the exhaust pop on decel? Does the carb spit or backfire? Just making sure you eliminated an exhaust leak.
I know you checked for an intake leak with carb cleaner, but what you describe sounds like an intake manifold leak. I would check, or maybe just replace gaskets, and check condition of manifold. Good luck.