1981 Ski-Doo Shop Manual Supplement, Page 52Get this manual
SECTION 03 SUB-SECTION 03 (IGNITION TIMING) )Tighten the armature plate screwsCAUTION: Make sure armature plate screws are well secured
If flywheel mark did not align within magneto housing marks, armature plate must be adjustedArmature plate will have to be moved to advance or retard timing
Reassemble starter pulley and assemblyTo adjust remove rewing 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)Recheck engine timing (make sure engine is cold) Reinstall inspection plug