Ignition And Ignition Control System; Checking The Ignition Spark Gap; Checking The Spark Plug Caps - Yamaha F15B Service Manual

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Ignition and ignition control
system

Checking the ignition spark gap

1. Disconnect the spark plug caps from the
spark plugs.
2. Connect the spark gap tester to the spark
plug cap.
Ignition tester: 90890-06754
3. Crank the engine and observe the spark
through the discharge window of the
spark gap tester. If it does not work prop-
erly, check the plug cap, ignition coil, or
the specified peak voltages.
w
9 Do not touch any of the connections of
the spark gap tester leads.
9 Do not let sparks leak out of the
removed spark plug caps.
9 Keep flammable gas or liquids away,
since this test can produce sparks.
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Electrical systems
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Checking the spark plug caps

1. Check the spark plug caps for cracks or
damage. Replace if necessary.
2. Remove the spark plug cap 1 from the
spark plug wire 2 by turning the cap
counter-clockwise.
3. Measure the spark plug cap resistance.
Spark plug cap resistance:
4.0 – 6.0 kΩ
4. Check the spark plug wire for damage or
cracks. Replace the ignition coil if neces-
sary.
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