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 - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
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