Section 07
ELECTRICAL SYSTEM
Sub-Section 02
(IGNITION SYSTEM)
07-02-4
Ignition Coil
The ignition coil steps up the voltage input from
the Multi-Purpose Electronic Module to high volt-
age current for both spark plugs.
IGNITION TIMING PROCEDURE
Before checking ignition timing with a strobo-
scopic timing light (dynamic test), it is mandatory
to scribe a timing mark on the PTO flywheel (stat-
ic 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.
NOTE:
Do not use the factory mark found on the
PTO flywheel to check ignition timing or trouble-
shoot any problems.
787 Engine
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 tim-
ing might have to be changed would be when re-
placing the crankshaft, the magneto rotor, the
trigger coil and the MPEM. If the ignition timing is
found incorrect, you should first check for proper
crankshaft alignment. This might be the indication
of a twisted crankshaft.
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.
Between 3000 and 4000 RPM, the spark advance
does not change. So when checking ignition tim-
ing 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.
2. Remove PTO flywheel guard.
F00H0FA
-
CAUTION
The relation between the PTO flywheel mark
position and crankshaft position may
change as the PTO flywheel is screwed on
the crankshaft. As an example, when the
PTO flywheel is reinstall on the crankshaft, it
can slightly turns on the crankshaft when the
engine is accelerated, even if it is properly
torqued. This is enough to obtain a false ig-
nition timing reading. Always verify PTO fly-
wheel mark position before checking
ignition timing with an appropriate timing
light.
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