1978 Ski-Doo Shop Manual, Page 223Get this manual
SECTION 04 SUB-SECTION 04, (IGNITION TIMING) (
6Ignition timing can change upon tightening therefore, rotate the magneto counter-clockwise 14 of turn and slowly turn the magneto back in clockwise directionAs soon as the timing marks align the timing light should fluctuate, or the tone signal level should varyReadjust if necessary
Too early: Decrease points gap
: Too early: Turn armature plate clockwise
Too late: Increase points gap