1999 Ski-Doo Factory Shop Manual Volume Two, Page 260Get this manual
Section 06 ELECTRICAL Subsection 02 (IGNITION TIMING)
NOTE: These marks cannot be used to check dynamic (with engine running) ignition timing with timing light: another mark is scribed on magneto flywheel or damper for this purposeWhen flywheel protrusion dot aligns with center of trigger coil core, flywheel mark and crankcase center mark must be aligned
All Models
Checking Ignition Timing
Use timing light (PN 529 031 900)To check the ignition timing, refer to illustration and proceed as follows:
All Models Except Summit 670 and MX 670 HO Engine should be cold when checking timingDo not let engine idle for more than 20 seconds and make checks quicklyAll Models