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 - On the Road with Dave Gohl: Tractor Club Beginnings - by Dave Gohl. I was surprised about a month ago when I got a call from a fellow tractor croonie. His message was interesting and to the point. He's says "Dave, I've been thinking about starting a Two Cylinder club for our area. What do ya think?" It was a loaded question. I said that I would be interested, and was wondering what his next step was. (Although I was talking under my breath, since I thought of this some years ago) My friend, Arlyn Lamb of Lakeville, Minnesota was sincere in his miss
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