Checking The Spark Plug Cap; Checking The Pulser Coil - Yamaha F30B 2018 Service Manual

Checking the spark plug cap

1. Measure:
• Spark plug cap resistance
Out of specification  Replace.
Spark plug cap resistance (refer-
ence data)
5.0 k
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a. Remove the spark plug cap from the spark
plug wire by turning the spark plug cap
counterclockwise.
b. Measure the spark plug cap resistance.
c. Install the spark plug cap to the spark plug
wire by turning the spark plug cap clock-
wise.
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Checking the pulser coil

1. Measure:
• Pulser coil output peak voltage
Out of specification  Measure the pulser
coil resistance.
Pulser coil output peak voltage
(reference data)
White/Red (W/R)–Black (B)
Un-
loaded
r/min
DC V 5.0
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a. Disconnect the pulser coil connectors "a".
b. While cranking the engine, measure the
peak voltage under unloaded condition.
a
W/R
B
c. Connect the pulser coil connectors "a".
d. Remove the clip from the engine shut-off
switch.
e. While cranking the engine, measure the
peak voltage under loaded condition.
f. Insert the clip into the engine shut-off
switch.
5-30
Ignition unit and component
Loaded
Cranking 1500
2.7 6.5
a
W/R
B
3500
9.8