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(1) In-line fuel filter, then clean the carb. Tiny amounts of rust in the fuel tank will move through the straner and casue problems. I didn't belive this until someone convinced me - and since I've added one to a B I own I've had no more problem. (2) Check your intake manifold for leaks or holes. This usually means it runs too lean, but it casn make a huge difference. Some leaks or holes only show after the manifild warms up to operating temp. (3) Make sure your carb float doesn't have a hole in it - shake it to make sure there's no gas inside (you already have done this I'm sure). (4) Make sure your timing is set correctly. Incorrect timing can make a tractor do wierd things. (5) The governor could be worn, but it should still run ok sitting still (I think). (6) Use a single strand of wire from a 16 gauge stranded electrical wire to make sure all the ports are open in the carb. (7) Make sure your distributor cap isn't cracked - I'm assuming you put a new one on. That's all I can come up with for now. Burned valves or incorrectly adjusted valves can do some interesting things like this too.
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