Home › Forum › Ask A Member › Mark 20 no spark › Re: Mark 20 no spark
April 14, 2018 at 5:43 pm
#73980
quote green thumbs:
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.
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
right cam is on the rotor. air gap was at the rotor. new condensers. Is there a test for the points as far as resistance?