1997 Ski-Doo Factory Shop Manual Volume Two, Page 197Get this manual
Section 05 ELECTRICAL Sub-Section 03 (IGNITION TIMING)
WARNING
Place ski tips against wall, raise rear of vehicle on stand, so that track does not contact the groundDo not allow anyone in front of or behind the vehicle while engine is runningKeep clear of track and do not wear loose clothing which can get caught in moving parts1Connect the timing light pick-up to spark plug cable and the power connections to the batteryNOTE: To avoid an incorrect reading due to parallax, view the magneto flywheel and the crankcase timing marks in straight line2Start the engine and raise the engine speed at least to 2000 RPM while observing the timing marks, refer to illustrationThe magneto flywheel mark scribed previously and the crankcase arrow should be perfectly alignedIf the marks do not align, faulty trigger coil (check proper grounding of coil) or faulty CDI module could be the cause: substitute one part at time and recheck timing marks (check connectors condition prior to substituting any part)NOTE: Ignition timing may be verified when engine speed is anywhere within 2000-6000 RPM