Ski-Doo FORMULA S 1997, Shop Manual

Page: 491 / 926

Section 05 ELECTRICAL
Sub-Section 03 (IGNITION TIMING)
05-03-5
5. Verify the position of the timing mark on the
magneto flywheel as follows:
NOTE: When checking timing, certain pro-
cedures require that the magneto flywheel
be turned in a clockwise direction, viewed facing
the magneto. If it is necessary to turn back (coun-
terclockwise) for any reason, rotate the magneto
flywheel at least one-quarter turn counterclock-
wise, and then rotate it clockwise. The last mag-
neto flywheel movement when making a critical
check must always be in a clockwise direction, to
ensure that the slack in engine moving parts is
taken-up.
a. Rotate the magneto flywheel counterclock-
wise, one-quarter turn then carefully rotate it
clockwise until the needle indicates the
specified measurement, indicated in TECH-
NICAL DATA 09-02.
b. Make sure that the dot located on the side
of the magneto flywheel protrusion perfectly
aligns with center of trigger coil core, refer to
illustration.
c. If the marks do not align, loosen trigger coil
screws and move trigger coil to align dot
with center of trigger coil core.
583 ENGINE
1. Dot aligned with center of trigger coil core
2. Retard
3. Advance
454, 494 AND 670 ENGINES
1. Advance
2. Retard
NOTE: These marks can not be used to
check dynamic (with engine running) ignition
timing with a timing light: an other mark is scribed
on magneto flywheel or damper for this purpose.
When flywheel protrusion dot aligns with center
of trigger coil core, flywheel mark and crankcase
center mark must be aligned.
Checking Ignition Timing
Use timing light (P/N 529 0319 00).
To check the ignition timing, refer to illustration
and proceed as follows:
NOTE: Engine should be cold when check-
ing timing. Do not idle engine for more than
20 seconds and make checks quickly.
1. Connect the timing light pick-up to a spark plug
cable and the power connections to the battery.
NOTE: To avoid an incorrect reading due to
parallax, view the magneto flywheel and the
crankcase timing marks in a straight line.
2. Start the engine and point timing light straight
in line with the crankcase timing mark. Bring
engine to 6000 RPM for a brief instant.
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WARNING
Place ski tips against a wall, raise rear of ve-
hicle on a stand, so that track does not con-
tact the ground. Do not allow anyone in front
of or behind the vehicle while engine is run-
ning. Keep clear of track and do not wear
loose clothing which can get caught in mov-
ing parts.
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