Section 10
ELECTRICAL SYSTEM
Subsection 02
(IGNITION SYSTEM)
SMR2002-038_10_02A.FM
10-02-7
IGNITION TIMING
Before checking ignition timing with a stroboscop-
ic timing light (dynamic test), it is mandatory to
scribe a timing mark on the PTO flywheel (static
test) corresponding to the specific engine.
Also, the timing mark scribed on the PTO flywheel
can be used to troubleshoot a broken magneto
woodruff key.
CAUTION:
The relation between the PTO fly-
wheel mark position and crankshaft position may
change as the PTO flywheel might move/tighten/
loosen on the crankshaft. As an example on
threaded flywheels, when the engine is accel-
erated out of water, PTO flywheel may tighten
then loosen when the engine is decelerated.
This will result in a false ignition timing read-
ing. Always verify PTO flywheel mark position
before checking ignition timing with an appro-
priate timing light. If mark does not align with
tool, repeat static test to ensure flywheel has
not loosen or moved before changing the igni-
tion timing.
NOTE:
Do not use the factory mark found on the
PTO flywheel to check ignition timing or trouble-
shoot any problems.
787 RFI and 947 Engines
Normally ignition timing adjustment should not be
required. It has been set at factory and it should
remain correctly adjusted since every part is fixed
and not adjustable. The only time the ignition timing
might have to be changed would be when replacing
the crankshaft, the magneto rotor, the trigger coil
on
947 engines
(or the CPS on
RFI models
) and
the MPEM (or the ECU on the
RFI models
). If the
ignition timing is found incorrect, you should first
check for proper crankshaft alignment. This might
be the indication of a twisted crankshaft.
RFI Models
The fixed timing mode must be activated before
checking ignition timing. See FIXED TIMING
FUNCTION paragraph.
947 Engines Only
With this DC-CDI system, the ignition timing can
be checked with either the engine hot or cold. Al-
so, the ignition timing is to be checked at 3500
RPM with the timing light.
NOTE:
Between 3000 and 4000 RPM, the spark
advance does not change. So when checking igni-
tion timing at 3500 RPM, a change in engine speed
within ± 500 RPM will not affect the timing mark
when checked with the timing light.
Static Test
All Engines
1. Disconnect MAG side spark plug wire and con-
nect wire to grounding device then remove
spark plug.
CAUTION:
Never crank engine with spark plugs
removed unless spark plug cables are connect-
ed to the grounding device.
2. Remove PTO flywheel guard.
717 Engines
3. Install timing mark pointer tool on engine using
wing nuts previously removed.
TYPICAL
1. Timing mark pointer tool (P/N 295 000 130)
F01H5SA
1
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