Check your carb boots and other areas/hoses around the carbs for a vac leak.
I re installed my carbs once (for the 4th time that day) and was to tired/annoyed/mad at myself to check if I properly seated the carbs into the engine and air box side boots. Once I started it my idle was awful even after adjusting the mixture screws and the carbs themselves with the knob on the left side of the bike (if you are sitting on it) rechecked the boots and properly seated them which fixed the hanging tach needle.
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