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Steve, a typical cause (unless coil is bad) of severe coil overheating (so hot cant lay hands on) is when one uses 12 volts on a 6 volt coil with no external ballast, thereby exceeding the coils current (and heat dissipation) rating PLUS the points would burn up prematurely. I dont think the condensor is the problem, if they are bad the points burn up quicker and the sparks weaker but I dont see that as any typical cause for the coil to overcurrent or overheat !!!! Also the black exhaust smoke sounds like youre running too rich which can fastly gas foul n carbon up the plugs,,,,, ,see below If you have a 12 volt tractor ???? and are using a 6 volt coil, it would be MUCH cheaper to simply add an external voltage dropping (12 to 6) current reducing Ballast Resistor then to buy a full 12 volt rated coil. It wires in series in the ignition circuit after the ignition switch and ahead of the coil. Ideally, the Ballast ohms rating would be near the same as the coils primary winding resistance (measured between its lil + and - terminals) and typical ballast values are from 1.5 to 2 ohms or so easily available from NAPA or Tractor Supply or Rural King or IHC etc etc. NOTE if you opt for the more expensive 12 volt coil (so no ballast is required) be sure and get a full 12 volt rated one thats DOES NOT require any external ballast. The coils that are labeled "12 volts for use with an external ballast" are in reality just 6 volt coils, you need a full 12 volt rated NOT requiring any external ballast. NOTE Although a coil will still fire if wired at incorrect polarity, they run warmer and not as efficient plus yield a weaker spark. If youre at Positive ground the coils + wires to the distributor while if youre at Neg ground its - wires to the distributor. If the plugs exhibit an even flat black colored sooty appearance, thats indicative of excess unburned fuel from running the carb set too rich and/or the chokes not fully open and/or theres a restriction in the air cleaner or air inlet piping, any of which can cause her to throw exces black smoke out the stack, does yours??? A weak spark can contribute to plug fouling also. It can help if you use thermostats or shutters or other radiator air restrictiosn to keep the engine temp up to 180 and over,,,,, ,use HOTTER PLUGS,,,,,dont run the carb over rich,,,,, keep the plugs n ignition n poin ts n condensor all up in good shape. Let us know what happens John T
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