Ignition And Ignition Control System; Checking The Ignition Spark; Checking The Spark Plug Wires; Checking The Ignition Coils - Yamaha F50F Service Manual

Ignition and ignition control
system

Checking the ignition spark

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 spe-
cial service tool. Check the ignition sys-
tem if the spark is weak.
WARNING
• Do not touch any of the connections of
the ignition 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.
6C13G11
Electrical components / Ignition and ignition control system
NOTE:
The ignition spark can also be checked using
8
the "Stationary test" of the Yamaha Diagnos-
tic System.

Checking the spark plug wires

1. Remove the spark plug wires from the
2. Remove the spark plug wires from the
3. Measure the spark plug wire resistance.

Checking the ignition coils

1. Remove the spark plug wires from the
2. Disconnect the ignition coil coupler.
spark plugs.
ignition coils.
Replace if out of specification.
Spark plug wire resistance:
1.9–5.0 kΩ
ignition coils.
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