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It just seems to be a quirk of these carbs. The one I'm using had a mega-rich problem during idle once. It belched black smoke out the muffler and I had to keep reving it to keep it running, which obvously made it even richer due to the accel pump shot. Anyway whatever it was cleared in a few seconds and has been running fine since. I think a chunk of debris from the tank or inside one of the lines got caught in a jet, and reving it allowed the chunk to dislodge. Or perhaps it was already in the float bowl and got stuck between a meetering rod and a primary jet, and reving it lifted the rod allowing the chunk to get sucked through and out.
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