Ski-Doo 2005 MACH Z, Shop Manual

Page: 176 / 343

Section 05 ELECTRICAL SYSTEM
Subsection 01 (IGNITION SYSTEM)
– Screw the adaptor into the spark plug hole
and tighten to prevent movement in the plug
hole.
– Position the dial face toward the PTO. 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 adap-
tor lock nut by hand.
• Locate the piston TDC position as follows:
– Slowly rotate the drive pulley 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 drive pulley 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.
• Rotate the drive pulley counterclockwise, one-
quarter turn then carefully rotate it clockwise
until the needle indicates the specified mea-
surement.
ENGINE MEASUREMENT
995 SDI 7.87 mm (0.310 in)
• With the TDC gauge indicating specified timing,
scribe a mark on drive pulley inner half and on
engine support.
A35C2OA
TIMING MARKS
Remove TDC gauge.
Checking Ignition Timing
To check the ignition timing proceed as follows:

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.
Connect the timing light pick-up to a spark plug
cable on MAG side.
Connect the digital/inductive type tachometer
(P/N 529 014 500) on same spark plug cable.
F01B1GA
TACHOMETER
Start the engine and point timing light on timing
mark.
The timing marks must be aligned with pointer
end. If such is not the case, note if timing is re-
tarded or advanced.
ENGINE TOLERANCE
995 SDI ± 0.5°
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