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Sure, it could be something other than the carb, but is most likely fuel delivery. My best guesses, it could be one of the following, in no particular order:
Transition circuit not flowing fuel.
Vacuum leak between baseplate and main body.
Accel pump shot needs more duration.
Need one jet size larger on the primary side to cover the flat spot.
remember these are guesses, it's difficult to diagnaose a problem by way of description only. Is it a new carb? Was the carb rebuilt recently? Was the carb "good' then just sat on a shelf for a while?
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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