BOMBARDIER ski-doo Tundra Scandic 2004 Series, Shop Manual, Page: 297 / 427

Section 06 ELECTRICAL
Subsection 02 (IGNITION TIMING)
06-02-6
MMR2004-130_06_02A.FM
2. To correctly locate and mark a timing mark on a
new service magneto flywheel.
3. To verify the correct location of the factory tim-
ing mark.
4. To detect a wrong magneto flywheel.
To verify the position of the timing mark on the
magneto flywheel, proceed as follows:
1. Clean the area around the spark plugs, and re-
move them.
2. Remove the rewind starter from the engine.
3. Install the TDC gauge in the spark plug hole,
(magneto/generator side) and adjust as follows:
a. Position the magneto flywheel at approximate-
ly TDC.
INSTALLATION OF TDC GAUGE
1. Adapter lock nut
2. Gauge on MAG side cylinder
b. Assemble the gauge to the adapter and tight-
en the roller lock nut. Do not tighten the adapt-
er lock nut.
c. Screw the adapter into the spark plug hole
and tighten to prevent movement in the plug
hole.
d. Position the dial face toward the magneto/
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 adapter lock nut by hand.
4. Locate the piston TDC position as follows:
a. 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.
b. Rotate the dial face so that 0 (zero) is in line
with the needle when it stops moving.
c. Again, slowly rotate the magneto flywheel
back and forth across TDC and adjust the dial
face to 0 (zero), until the needle always stops
exactly at 0 (zero) before changing direction.
d. 0 (zero) now indicates exact TDC.
5. 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 magneto/
generator. If it is necessary to turn back (counter-
clockwise) for any reason, rotate the magneto fly-
wheel at least 1/4 turn counterclockwise, and then
rotate it clockwise. The last magneto flywheel
movement when making a critical check must al-
ways be in a clockwise direction, to ensure that
the slack in engine moving parts is taken-up.
a. Rotate the magneto flywheel 1/4 turn coun-
terclockwise, 1/4 turn then carefully rotate it
clockwise until the needle indicates the speci-
fied measurement. Refer to TECHNICAL DATA.
b. Verify that the magneto flywheel mark per-
fectly aligns with the mark on the trigger coil,
refer to illustration.
c. If the marks do not align, check magneto fly-
wheel 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.
A17E0YA
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