Ignition Unit And Component; Checking The Ignition Spark; Checking The Spark Plug Cap - Yamaha F4B Service Manual

ELEC
Rectifier Regulator continuity
(testing diode mode):
Tester probe
 
b
a c
d
a
b c
d
a
c b
d
a
d b
c
OL: Indicates an overload
TIP:
Make sure to set the tester measurement
range to the diode mode.
5. Connect the
connectors a, b, c, and Rectifier
Regulator ground lead d.
6. Fasten the Rectifier Regulator leads
using the holder a.

Ignition unit and component

Checking the ignition spark

1. Disconnect the spark plug cap from the
spark plug.
2. Connect the spark plug cap to the special
service tool a.
5-5
Electrical system
a
b
c
d
Display value
(reference data)
OL
OL
OL
0.384 V
0.938 V
0.649 V
0.384 V
0.938 V
0.654 V
0.716 V
0.384 V
0.384 V
Rectifier Regulator
3. Crank the engine and check for a spark.
WARNING! Do not touch any of the
connections of the special service
tool.
Ignition tester (spark gap tester) a:
90890-06754
4. Disconnect the special service tool a,
and then connect the spark plug cap.

Checking the spark plug cap

1. Remove the spark plug cap from the
spark plug wire by turning the cap coun-
terclockwise.
2. Measure the spark plug cap resistance.
Spark plug cap resistance
(reference data):
5.0 k at 20 °C (68 °F)
OK
a