1983 Ski-Doo Shop Manual, Page 205Get this manual
SECTION 04 ELECTRICAL SUB-SECTION 02 (IGNITION TIMING)
Bring engine to 6000 R.P.Mfor brief instantCheck timing mark alignmentIf flywheel mark aligns within housing marks, timing is correctStop engine
To adjust remove rewind starter assembly and starter pulleyUsing mm Allen key, loosen the two armature plate retaining screws and lightly move plate in appropriate direction(Refer to the difference between timing marks to determine how much to move the armature plate)
Flywheel mark within housing marks