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It was not a crack in the carb top but a leaky accelerator pump leaking internally and seaping out of the area where the stem of the pump pokes through the top of the carb. It was pretty easy to spot.

I had a similar off idle stumble with my 75 Nyb which was driving me crazy. I did many of the similar adjustments that you have done as far as timing and idle air mixtures. I bought a rebuilt carb which solved the problem, but the problem returned. After a close inspection I noticed a small fuel...