Ski-Doo FORMULA III, Руководство по ремонту

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Section 06 ELECTRICAL
Sub-Section 02 (IGNITION TIMING)
06-02-2
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 10.
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, slacken trigger coil
screws and move trigger coil to align dot
with center of trigger coil core.
583, 599 AND 779 ENGINES
1. Dot aligned with center of trigger coil core
2. Retard
3. Advance
454 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
A timing light capable of flashing reliably over
6000 RPM should be used. The following timing
lights are recommended : SNAP-ON no. MT 212,
ELECTRO-SPECIALTY no. 978 and ELECTRO-
SPECIALTY no. TL 2802 which uses its own type
C alkaline batteries.
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. Use a 12 V
battery to power the timing light when working on
manual start models, if light is not self-powered.
WARNING : Place ski tips against a wall,
raise rear of vehicle on a stand, so that
track does not contact the ground. Do not al-
low anyone in front of or behind the vehicle
while engine is running. Keep clear of track
and do not wear loose clothing which can get
caught in moving parts.
1. Connect the timing light pick-up to a spark plug
cable and the power connections to the battery.
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