Checking The Ignition Spark Gap; Checking The Spark Plug Caps - Yamaha FT50C Service Manual

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. Set the spark gap length on the adjusting
knob.
Ignition spark gap: 9 mm (0.35 in)
4. Crank the engine and observe the spark
through the discharge window of the
spark gap tester. Check the ignition coil if
out of specification.
62Y5A11
Ignition system and Ignition control system
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
high-tension cords by turning the caps
counterclockwise.
2. Measure the spark plug cap resistance.
Replace if out of specification.
Spark plug cap resistance:
3.75–6.25 kΩ
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