Ignition and
Battery
Charging
1
IGNITION
SYSTEM DESCRIPTION
This engine is equipped with an electronic battery
ignition system. Both spark plugs fire simultaneously,
thus the need
for
a distributor is eliminated, The
electronic ignition module is located on the engine gear
cover behind the flywheel. The module receivesa timing
signal from magnets within the trigger ring which rotates
with the engine crankshaft (Figure
1).
If
the electronic
ignition is suspected of malfunctioning, proceed as
follows:
IGNITION
MODULE
ES-1670
FIGURE
1.
IGNITION
MODULE
AND
TRIGGER
RING
1.
Check all electrical connections to be sure they are
clean and tight.
If
all connections are good and
I_]
Accidentalstarting
of
the engine
*WARN"
can result in severe personal
injury
or
death. Remove spark plugs before
proceeding.
Ignition of cylinder gases can
D
AWARNING
cause severe personal injury.
Ground spark tester away from spark plug hole.
3.
Pull spark plug wires
off
spark plugs and remove
spark plugs. Connect an approved spark tester to
each
of
the spark plug wiresand ground them away
from spark plug hole. Turn key on and crank engine
over for
5
seconds while watching for spark.
If
a
spark occurs regularly, the problem is not in the
ignition system. If no spark occurs, go to step
4.
71
Incorrect wiring can cause elec-
ACAUT'oN
tronic ignition damage.
Do
not
attach any lead or jumper with power (such as B+)
to
coil negative terminal.
4.
Connect a jumper lead directly from the positive
battery terminal to the positive
(+)
coil terminal
(smaller diameter of the two threaded posts). Crank
engine over while watching for spark.
If
spark
occurs, the problem is in the low oil pressure cut out
switch (if equipped) or related wiring, the lubricating
system (low oil pressure), or in the other circuitry
bringing voltage to the coil.
If
no spark occurs, go to
step
5.
5.
Connect positive side of voltmeter to negative
(-)
coil terminal (larger diameter
of
the
two
threaded
posts) and negative side of voltmeter to engine
ground. Turn key on and rotate flywheel slowly by
hand while observing voltmeter. Voltage should
switch between battery voltage and
1-1.5
for each
revolution. If voltage does not switch properly,
replace ignition module.
wiring
is
intact, go to step
2.
2.
Refer
to
IGNITION
COIL
section to test coil for
proper resistance.
If
coil checks out good, go to
step
3.
ACAUT~ON
Incorrect wiring can cause elec-
tronic ignition damage.
Do
not
affach any lead or jumper with power (such
as
B+)
to
coil negative terminal.
6. Install spark plugs and wires.
If
ignition module is
being replaced, be sure to connect red lead from
new ignition module
to
positive (+)terminal of coil,
black lead from module
to
negative
(-)
terminal of
coil.
The
elecironjc
ignjijon
produces
A
WARNING
current which can cause elec-
trical shock.
Do
not touch electrical components
or wires while ignition is on.
8-1
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