Mark 20 has magneto 301-73. Cam is on magnet rotor
Swapping in KNOWN good coils and condensers would narrow the field of possible problems. Be aware that for a spark to jump spark plug gap under compression requires much more voltage that to jump same gap in open air.
Coils with internal leakage may show a spark in open .but, ground out internally rather than thru spark plug when under compression.
Compare your reassembled points with a set that works…Murphy’s Law states when it is
equally likely to assemble something correctly or incorrectly , chance favors the wrong way.
I am well acquainted with Mr. Murphy’s Laws…unfortunately.
About all I know of subject.
Louis
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