Yamaha F150A, Service Manual

Page: 152 / 493

5-21
Ignition unit and component
OL: Indicates overload
5. Connect the Rectifier Regulator coupler
and lighting coil coupler.
Ignition unit and component
Checking the ignition spark
1. Disconnect the spark plug wire from the
spark plug.
2. Connect the spark plug wire to the spe-
cial service tool “1”.
3. Check the ignition spark using the YDIS
“Stationary test”.
Do not touch any of the connections of
the special service tool.
4. Remove the special service tool, and
then connect the spark plug wire.
Checking the spark plug wire
1. Remove the spark plug wires.
2. Measure the spark plug wire resistance.
3. Install the spark plug wires.
Checking the ignition coil
1. Disconnect the ignition coil couplers “a”
and “b”.
Rectifier Regulator continuity
(testing diode mode):
Tester probe
Display value
(reference data)
(+) (–)
a
b
OL
c
d 0.439 V
e 0.434 V
f OL
b
a
OL
c
d 0.440 V
e 0.436 V
f OL
c
a
OL
b
d 0.439 V
e 0.441 V
f OL
d
a
OL
b
c
e
f
e
a
OL
b
c
d
f
f
a 0.436 V
b 0.435 V
c 0.437 V
d 0.774 V
e 0.772 V
Ignition tester (spark gap tester) “1”:
90890-06754
Spark plug wire resistance:
#1: 4.6–10.9 k
Ω
at 20 °C (68 °F)
#2: 3.3–8.0 k
Ω
at 20 °C (68 °F)
#3: 3.8–9.3 k
Ω
at 20 °C (68 °F)
#4: 4.2–10.0 k
Ω
at 20 °C (68 °F)
OK
1