2004 Skidoo ZX Series Service Manual, Page 438Get this manual
Section 09 ELECTRICAL SYSTEM Subsection 01 (IGNITION TIMING)
SCRIBING TIMING MARK
Clean the area around the MAG spark plug, and remove it Install the TDC gauge in the spark plug hole, (magneto side) and adjust as follows: Position the MAG piston at approximately TDC now indicates exact TDC Rotate the drive pulley clockwise, one-quarter turn then carefully rotate it counterclockwise until the needle indicates the specified measurement, indicated in TECHNICAL DATA Twist wire as shown and use it as pointerInstall the wire on upper starter bolt
A29E0RA A32C9GA
TYPICAL 1TDC gauge on MAG side
1Pointer