Yamaha F100C Service Manual page 327

(Ignition system)
Check the ignition spark gap using the spark gap tester.
Out of specifi-
cation?
Yes
Replace the spark plug.
(Compression pressure)
Check that there is no secondary air intake on the contact surfaces of
the intake manifold and crankcase.
Is there air
intake?
No
Check the compression pres-
sure of the combustion chamber.
62Y5A11
No
Check the ignition system out-
put peak voltage.
Yes
Replace the respective seals.
Power unit
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