If an engine is running too rich that can carbon blacken n foul the plugs and she keeps running worse over time as a result. Sure, a weak spark can cause incomplete combustion and you may start seeing some black (unburned fuel) smoke exiting the stack. Id start with a fresh set of plugs and a good set of points n condensor and dont run the carb any richer then necessary, you dont wanna see a lot of black smoke (over rich) out the stack.
As far as spark quality it should be a bright highly visible blue versus a thin wimpy yellow lookin spark.
Are you sure the intake system, pipe and air cleaner etc etc are all clean open and free and the choke butterfly is fully opening?? And then adjust the carb so its not over rich and with good plugs n wires n cap n rotor and points maybe it will be okay. Im NOT an IHC carb specialist only know over rich running will eventually carbon foul the plugs and make things worse.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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