Service manual

69J1D11
9-10
1
2
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7
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9
Ignition system
Compression pressure
Out of
specification?
Yes
No
Out of
specification?
Yes
Out of
specification?
NoYes
Check the ignition
system using the
Yamaha Diagnostic
System.
Replace the ignition coil.
Check the ignition spark gap using the spark gap tester.
Replace the spark plug.
Check the ignition system out-
put peak voltage.
Check the ignition coils resist-
ence.
No
Check the ignition
system using the
Yamaha Diagnostic
System.
Is there air
intake?
Replace the respective 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 crankcase.
Power unit