Yamaha F150A Service Manual page 292

TRBL
SHTG
Ignition system
Check the condition of the spark
plugs.
Good condition?
Yes
Check the ignition spark using
the spark gap tester.
Good spark?
No
Check the ignition coil resis-
tance.
Good condition?
Yes
Check the spark plug wire resis-
tance and the spark plug caps
for salt buildup.
Continued on next page.
9-7
Troubleshooting
No
Clean, adjust, or replace the
spark plugs.
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 and liquids away, since this test can produce
sparks.
Yes Check the pulser coil output
peak voltage or resistance.
Check the starting system or
the fuel system.
No
Repair or replace the defective
parts.
Good condition?
Yes
No Replace the stator
assembly.
63P3F11