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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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