I have this problem, but only in the cold around 6-7k, it just kinda lags/stutters a bit. I asked /r/motorcycles on reddit, they just thought it was a powerband issue.
I'm all stock as well, and when I bought the bike 1,700 miles ago, PO said the carbs were entirely redone/cleaned/etc.
I might have to tinker with the idle mix screws when I eventually do more work on it.
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