It is my understanding the resistor is there to reduce voltage so you do not burn up your points. If full voltage was allowed to go through the ignition it would not work for long. As far as the occasional good spark, check the condenser. Could be faulty from the get go! If you can, change it. As far as compression causing ignition problems, not sure. The only time compression seems involved with ignition is when a spark plug is faulty and will not fire under compression. Things I learned from my dad years ago! Hope this helps!
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