Technical data

Section 08 ELECTRICAL SYSTEM
Sub-Section 02 (IGNITION SYSTEM)
08-02-8
The timing mark refer to the physical component
position when the spark must occur. The DC-CDI
module must be synchronized with the mark. For
instance, on a particular engine, the timing correc-
tion may need to be advanced to 2° so that the
mark aligns with timing mark pointer tool. This is
not the real spark advance, just a correction for
the tolerances of the mechanical components.
Knowing that, you select with the programmer
the higher or lower number to advance or retard
the actual timing correction by referring to the fol-
lowing chart.
Examples :
a. You found the flywheel mark advanced. You
must retard the ignition timing.
– The programmer gives you the number 3.
Referring to the chart, number 3 returns a
correction of 2° (advanced) and this is too
much in this case.
– You estimate the correction should be set to
1° (advanced) to align flywheel mark. Back in
the chart, look to find 1° (advanced). This
gives number 4. Enter this number with the
programmer.
– You recheck the timing with the timing light
and if the mark is aligned, ignition timing is
properly set.
b. You found the flywheel mark advanced. You
must retard the ignition timing.
—The programmer gives you the number 3. Refer-
ring to the chart, number 3 returns a correction of
2° (advanced) and this is too much in this case.
– You estimate the correction should be set to
1° (advanced) to align flywheel mark. Back in
the chart, look to find 1° (advanced). This
gives number 4. Enter this number with the
programmer.
– You recheck the timing with the timing light
and found that the flywheel mark is still too
advanced. You know now that the correction
made previously was not enough and you es-
timate the correction should be set to - 2° (re-
tarded) to align flywheel mark. Back in the
chart, look to find - 2° (retarded). This gives
number 6. Enter this number with the pro-
grammer.
– You recheck the timing with the timing light
and if the mark is aligned, ignition timing is
properly set.
c. You found the flywheel mark retarded. You
must advance the ignition timing.
– The programmer gives you the number 4.
Referring to the chart, number 4 returns a
correction of 1° (advanced) and this is not
enough in this case.
– You estimate the correction should be set to
2° (advanced) to align flywheel mark. Back in
the chart, look to find 2° (advanced). This
gives number 3. Enter this number with the
programmer.
– You recheck the timing with the timing light
and if the mark is aligned, the ignition timing
is properly set.
Proceed as follows to adjust the ignition timing
with the MPEM programmer :
1. Connect the communication cable to the
MPEM programmer and the other end to the
safety lanyard switch on the craft.
2. Press the
ON / C button on programmer and
enter your password.
3. Press
3 to choose Vehicle info in programmer.
4. Press
4 to choose Engine param.
5. Press 2 to choose Timing adjust .
6. The programmer display a number that is actu-
ally stored in the MPEM.
7. Press -- to choose
yes for modify then press
Enter .
8. Now punch in the number that corresponds to
the degree you want for the ignition timing then
press
Enter .
9. Press
Menu to go back one level.
TIMING CORRECTION CHART
Programmer number
(MPEM)
Ignition Timing
Correction
2 3°
3 2°
41°
10
5-1°
6 -2°
7 -3°
8 -4°
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