It kinda sounds like your float may be set too low and that what it is doing is running out everything in the fuel bowl and then it can't fill it back up quick enough. Let it sit for a few and it has time to fill the bowl up and do it again.
When you had the carb apart, did you take out the float, needle and seat and clean / inspect them? If you do this, prior to taking the float apart take a picture from the side with the carb turned upside down so we can see where it is set at.
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