Checking The Ignition Spark Gap; Checking The Spark Plug Caps; Checking The Ignition Coil - Yamaha F25C Service Manual

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Checking the ignition spark gap

1. Disconnect the spark plug caps from the
spark plugs.
2. Connect a spark plug cap to the special
service tool.
Ignition tester: 90890-06754
3. Crank the engine and observe the spark
through the discharge window of the
spark gap tester. Check the ignition sys-
tem if the spark is weak.
WARNING
• Do not touch any of the connections of
the spark gap tester leads.
• Do not let sparks leak out of the
removed spark plug caps.
• Keep flammable gas or liquids away,
since this test can produce sparks.

Checking the spark plug caps

1. Remove the spark plug caps from the
spark plug wires by turning the caps
counterclockwise.
8-7
Electrical systems
S6D58040
S6D58050
2. Measure the spark plug cap resistance.
Replace if out of specification.
Spark plug cap resistance: 4–6 kΩ

Checking the ignition coil

1. Remove the spark plug caps from the
spark plug wires by turning the caps
counterclockwise.
2. Disconnect the ignition coil connectors.
3. Measure the ignition coil resistance.
Replace if out of specification.
S6D58070
6D55F11