Yamaha F50F Service Manual page 287

Out of specification?
No
Check the ignition system, fuel
system, lubrication system, or
cooling system.
Ignition system
Check the condition of the spark
plugs.
Good condition?
Yes
Check the ignition spark using
the ignition tester.
Good spark?
No
Check the engine stop lanyard
switch for continuity.
Continued on next page.
6C13G11
Check the valve clearances or
Yes
disassemble and check the
engine.
No
Clean, adjust, or replace the
spark plugs.
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 and liquids away, since this test can produce
sparks.
Check the pulser coil output
Yes
peak voltage, resistance, or
pulser coil air gap.
Check the fuel system and com-
pression pressure.
No
Good condition?
Yes
Power unit
Adjust or replace
the pulser coil.
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