I am sure you know this already but there are several types of coil depending on use. They have different specs - mainly the resistance. The list includes at least:
Coil for normal ignition - no ballast resitor
Coil for normal ignition - with ballast resistor
Coil for electronic ignition
If you use the wrong one it will overheat and the insulation will start to break down resulting in a weak or no spark...
You should be able to find more info on t'internet.
Cheers, Robin
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