2001 Ski-Doo Factory Shop Manual Volume One, Page 235Get this manual
Section 06 ELECTRICAL Subsection 02 (IGNITION TIMING)
A17E10A
1Trigger coil mark 2Magneto flywheel mark
NOTE: These marks cannot be used to check dynamic (with engine running) ignition timing with timing light: new mark must be scribed on magneto flywheel for this purpose6Scribe new mark on magneto flywheel as follows: aRemove the fan cover from the enginebMaintain magneto flywheel so that previous marks remain alignedcScribe or punch mark on magneto flywheel so that it aligns perfectly with the arrow on crankcase, refer to illustrationThis new timing mark should be used for future timing checks (dynamic timing)dReinstall rewind startereCheck the timing with timing light (PN 529 031 900)