1972 Ski-Doo Shop Manual, Page 168Get this manual
ENGINE TIMING 18 of tum and slowly turn the magneto back in clockwise directionAs soon as the pointer aligns with the correct reading, the breaker points should just begin to open and the timing light should fluctuate20Recheck breaker points gap (.014" to .018")21Disconnect timing lightIf T.D.Cgauge was
used, unscrew adaptor lock nut, hold dial and unscrew adaptor from spark plug hole
22Inspect spark plug, replace if necessaryAdjust spark plug gap to .020 inch using wire
feeler gaugeInstall spark plugs and connect spark plug wires