1985 Ski-Doo snowmobile Service Manual, Page 343Get this manual
Section 04 ELECTRICAL Sub-section 02 (IGNITION TIMING)
Cold engine
Align mark
Marks must align
AOO3004003
AOO3004002
Recheck ignition timing with the timing marks at 6000 R.P.MIf marks do not align, move the armature plate until marks align at 6000 R.P.MThen scribe new mark on the magneto housing in line with the armature plate mark