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When was the last time you checked valve lash?
Check the spark plug colour as it sounds like the bikes idle jet could be running a bit lean. Try adjusting the idle screw after balancing the carbs.
Sounds like, from 10,000 miles away, fuel flowLook for a slightly kinked hose..Gas cap venting?..Filter..Dellorto carb filters..Petcock filter clean..Tank bag blocking the gas cap..EtcFloat bowls aren’t staying full is my wag