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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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