6D81G11
9-10
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Ignition system
Compression pressure
Yes
No
Within
specification?
No
Within
specification?
YesNo
Check the ignition
system using the
Yamaha Diagnostic
System.
Replace the ignition coil.
Check the ignition spark using
the spark checker.
Replace the spark plug.
Check the ignition system out-
put peak voltage.
Check the ignition coils resis-
tance.
Yes
Check the ignition
system using the
Yamaha Diagnostic
System.
WARNING
• Do not touch any of the connections of
the spark checker 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?
Is there air
intake?
Replace the defective seals.
Check the compression pres-
sure of the combustion chamber.
No
Yes
Check that there is no secondary air intake on the contact surfaces of
the intake manifold and cylinder head.
Power unit
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