Yamaha F100C Service Manual page 324

TRBL
SHTG
Symptom: Engine cranks, but will not start.
• Check the ignition system.
• Check the fuel system.
• Check the compression pressure of the power unit.
Check that the spark plugs pro-
duce sparks.
Are there sparks?
No
Check the condition of the spark
plugs.
Wet spark plugs?
Yes
Start the engine using dried or
new spark plugs.
Continued on next page.
9-3
Troubleshooting
Yes
Check the ignition spark using
the spark gap tester.
Check the ignition coil.
No
Check the fuel 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.
Below the
spark gap
specification?
No
Check the ignition
Yes
system output peak
voltage.
62Y5A11