Ski-Doo Ski Doo MX Z 2005 [297/1429] Verifying magneto flywheel timing mark position
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Ski-Doo Ski Doo MX Z 2005 [297/1429] Verifying magneto flywheel timing mark position

Ski-Doo Ski Doo GTX 2005 [297/1429] Verifying magneto flywheel timing mark position
Section 07 ELECTRICAL SYSTEM
Subsection 01 (IGNITION SYSTEM)
Verifying Magneto Flywheel Timing
Mark Position
Prior to checking the timing, it may be necessary
to verify the position of the timing mark on the
magneto flywheel, for the following reasons:
• To detect a missing or broken magneto flywheel
Woodruff key which would allow a change of
timing to occur, with eventual breakdown of the
engine.
• To correctly locate and mark a timing mark on a
new service magneto flywheel.
• To verify the correct location of the factory tim-
ing mark.
• To detect a wrong magneto flywheel corre-
sponding to a different engine type.
To verify the position of the timing mark on the
magneto flywheel, proceed as follows:
• Clean the area around the spark plugs, and re-
move them.
• Remove the rewind starter from the engine.
• Install the TDC gauge in the spark plug hole,
(magneto/generator side) and adjust as follows:
– Position the magneto flywheel at approxi-
mately TDC.
A17E0YA
2
1
TYPICAL — INSTALLATION OF TDC GAUGE
1. Adaptor lock nut
2. Gauge on MAG side cylinder
– Assemble the gauge to the adaptor and tight-
en the roller lock nut. Do not tighten the
adaptor lock nut.
– Screw the adaptor into the spark plug hole
and tighten to prevent movement in the plug
hole.
– Position the dial face toward the magne-
to/generator. Move the gauge down until
the needle just begins to move, then move
down a further 5 or 6 mm (approximately 1/4
in). Tighten adaptor lock nut by hand.
• Locate the piston TDC position as follows:
– Slowly rotate the magneto flywheel back and
forth across TDC while observing the needle.
Note that the needle stops moving only as
the piston is changing direction.
– Rotate the dial face so that «0» is in line with
the needle when it stops moving.
– Again, slowly rotate the magneto flywheel
back and forth across TDC and adjust the dial
face to «0», until the needle always stops
exactly at «0» before changing direction.
–«0» now indicates exact TDC.
• Verify the position of the timing mark on the
magneto flywheel as follows:
NOTE: When checking timing, certain procedures
require that the magneto flywheel be turned in
a clockwise direction, viewed facing the magne-
to/generator. If it is necessary to turn back (coun-
terclockwise) for any reason, rotate the magne-
to 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 tak-
en-up.
– Rotate the magneto flywheel counterclock-
wise, one-quarter turn then carefully rotate
it clockwise until the needle indicates the
specified measurement. Refer to TECHNI-
CAL DATA.
– Verify that the magneto flywheel mark per-
fectly aligns with the mark on the trigger coil,
refer to illustration.
– If the marks do not align, check magneto
flywheel and trigger coil part numbers and
check Woodruff key condition. If all parts are
the appropriate ones and if Woodruff key is in
good condition, continue the procedure.
mmr2005-082 283

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