While technically the Needle's job is to hold back the gas, it doesn't take much to overcome it's shut-off capabilities. I'd do a quick check of the petcock by removing the line going to the carb (not the vacuum line) and if it flows freely, just buy a new petcock and see if your problem goes bye bye.
RZ Rob
Bad Petcock, challenged Needle
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Re: Bad Petcock, challenged Needle
That's a good tip to run at least seasonally. Petcock is a safety for a float needle failure.