1999 Ski-Doo Factory Shop Manual Volume One, Page 240Get this manual
Section 06 ELECTRICAL Subsection 02 (IGNITION TIMING)
IGNITION TIMING
NIPPONDENSO CDI SYSTEM (WITHOUT TRIGGER COIL)
Tundra 277 Engine Type The 277 engine type uses single coil ignition systemRefer to CDI SYSTEM 04-05 for more informationsThis section is mainly divided in parts, the first one using Top Dead Center gauge to verify the magneto flywheel timing mark positionThe second one using stroboscopic timing light to check ignition timingFlywheel timing mark position verification is required: 1To detect missing or broken magneto flywheel Woodruff key which would allow change of timing to occur, with eventual break down of the engine2To correctly locate and mark timing mark on new service magneto flywheel3To verify the correct location of the factory timing mark4To detect wrong magneto flywheel corresponding to different engine typeAlways verify magneto flywheel timing mark position before checking ignition timing.90 80