1997 Ski-Doo Factory Shop Manual Volume Two, Page 195Get this manual
Section 05 ELECTRICAL Sub-Section 03 (IGNITION TIMING)
IGNITION TIMING
DUCATI CDI SYSTEM
443 and 503 Engine Types Proper ignition timing is determined by trigger coil positionIf for any reason, ignition timing accuracy is suspected, it can be checked as follows
Verifying Magneto Flywheel Timing Mark Position