I'm new here and don't know anything about tractors but I am a retired mechanic,
Black sooty plugs means too much gas or not enough spark, in adddition to what others have said, how is the fuel tank, full of rust. Could some of it be getting between the needle and seat, flooding the carb? You'll likeky end up with fuel in the engine oil, does the oil smell gassy or is overfull?
The other thing that pops in my mind is weak valve springs. Kind of hard to test them unless the heads on the bench but a vacuum gauge might show "fluttering"
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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