Ski-Doo FORMULA 500 1997, Shop Manual

Page: 196 / 352

Section 05 ELECTRICAL
Sub-Section 03 (IGNITION TIMING)
05-03-2
d. “0” now indicates exact TDC.
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/generator. If it is necessary to turn
back (counterclockwise) for any reason, rotate the
magneto flywheel at least one-quarter turn coun-
terclockwise, and then rotate it clockwise. The
last magneto flywheel movement when making a
critical check must always be in a clockwise direc-
tion, 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. Refer to TECHNI-
CAL DATA 09-02.
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.
1. Trigger coil mark
2. Magneto flywheel mark
NOTE: These marks cannot be used to
check dynamic (with engine running) ignition
timing with a timing light: a new mark must be
scribed on magneto flywheel for this purpose.
6. Scribe a new mark on magneto flywheel as fol-
lows.
a. Remove the fan cover from the engine.
b. Maintain magneto flywheel so that previous
marks remain aligned.
c. Scribe or punch a mark on magneto flywheel
so that it perfectly aligns with the arrow on
crankcase, refer to illustration. This new tim-
ing mark should be used for future timing
checks (dynamic timing).
d. Reinstall rewind starter.
e. Check the timing with a timing light.
1. Crankcase arrow
2. Scribe a mark here
3. Maintain verified timing marks aligned (static timing)
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.
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A17E10A
2
1
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A17E0ZA
1
2
3
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