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 - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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