Service Manual
Ignition and Battery Charging
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 enginegear
cover behind the flywheel. The module receives a 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
wiring is intact, go to step
2.
deliver full voltage to the spark
The electronic ignition will
plugs even when rotated by hand.
Care
should
be
taken to avoid an electrical shock.
Failure to remove spark plugs
before turning engine over may
result in engine starting, which may cause severe
personal injury.
away from
spark
plug hole may
Failure to ground spark tester
result in ignition
of
cyiinder gases and may cause
severe personal injury.
2.
Pull spark plug wires
off
spark plugs and remove
spark plugs. Connect an approved spark tester to
each of the spark plug wires and 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
3.
negative terminal. This will cause
Never put jumper lead to the coil
failure of
the
electronic ignition module.
3.
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
4.
4.
Refer to
IGNITION
COIL
section to test coil for
proper resistance.
If
coil checks out good, 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.
negative terminal.
This
will cause
Never put
B+
lead to the coil
failure of the electronic ignition module.
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.
8-
1