Yamaha F80B Service Manual page 228

TRBL
SHTG
Symptom: Engine cranks, but will not start (engine stop lanyard switch is operating nor-
mally).
• 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.
Continued on next page.
9-7
Troubleshooting
Yes
Check the ignition spark using
the ignition tester. (8-7)
Check the ignition coil resis-
tance. (8-7)
Check the spark plug wire resis-
tance and check the spark plug
cap for corrosion or rust. (8-7)
Check the ECM output peak
voltage. (8-8)
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.
Good spark?
No
Within
specification?
Yes
Good condition?
Yes
Check the pulser
Yes
coil output peak
voltage. (8-8)
No Replace the ignition
coil.
No Replace the spark
plug wire.
6D93G11