Bombardier SeaDoo 1990 factory shop manual, Page 95Get this manual
Section 07 ELECTRICAL Sub-section (IGNITION TIMING)
IGNITION TIMING
NIPPONDENSO ELECTRONIC IGNITION SYSTEM
This section is mainly divided in two parts, the first one using top dead center gauge to verify flywheel timing mark position The second one using stroboscopic timing light to check ignition timing Flywheel timing mark position verification is required to Rotate MAG flywheel clockwise (when facing !t) until piston is just before top deadcenter(TYPICAL)
Outer ring
1 Troubleshoot missing or broken flywheel woodruff key Troubleshoot flywheel corresponding to different engine type Scribe the timing mark on new service flywheel
Always verify flywheel timing mark position before checking ignition timing
Adaptor lock nut
Adaptor
Verifying Flywheel Timing Mark Position
1 DisconnectMAG side spark plug wire and remove spark plug2 Unfasten electrical box then move box and battery away to allow accessing ignition system 3Remove ignition housing cover Install and adiust TDC qauqe 295 000 065)