Bombardier SeaDoo 1997 factory shop manual, Page 163Get this manual
Section 07 ELECTRICAL SYSTEM Sub-Section 02 (IGNITION SYSTEM)
Recheck ignition timing (make sure engine is cold)Repeat armature plate positioning procedure if timing mark position is not adequate
787 Engine To correct the ignition timing, the data of the MPEM is changed using the MPEM programmer (PN 295 000 127)NOTE: For more information on the programmer, refer to its guideThrough the MPEM programmer, the ignition timing can be advanced up to or retarded up to 4F01H5UA
1Too advanced timing
CAUTION
In this case, turn armature plate clockwise when facing itExample When PTO flywheel mark is on left side of timing tool slot, it indicates retarded timing
If the ignition timing is adjusted too advanced, this will cause serious damage to the engineThe timing mark refer to the physical component position when the spark must occurThe MPEM must be synchronized with the markFor instance, on particular engine, the timing correction may need to be advanced to so that the mark aligns with timing mark pointer toolThis is not the real spark advance, just correction for the tolerances of the mechanical componentsKnowing that, you select with the programmer the higher or lower number to advance or retard the actual timing correction by referring to the following chartTIMING CORRECTION CHART Programmer number (MPEM) Ignition Timing Correction -1 -2 -3 -4