As I remember with a points system, you need a coil with around 5 ohms or else you need to wire in a resistor to the+ side. 3 ohms would be more suited to electronic ignition.
Just went through that when I had to replace the coil on an off branded tractor with a KT 19 on it which calls for the exact same points and condenser as a cast iron single cylinder Kohler.
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