When you held your hand over the air inlet, did you get a strong, steady vacuum against your hand?
If weak or pulsating, could be a vacuum leak around the intake gasket, carb mount gasket, or an intake valve not closing. That has a siamese manifold I think, they can burn through internally bringing exhaust back into the intake. If you can get a vacuum gauge, take a look at the vacuum if you can get it to idle. It should be a steady reading of 15-20 in. If low, there is a vacuum leak, if pulsating check the valves, run a compression test.
Here is a fuel circuit of that carb. There may be some difference in the main adjust configuration, but everything else is the same. Try opening the main adjust another turn. There is no numbered main jet, it is fully adjustable.
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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