Yamaha F100D - Page 231

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Ignition system
Compression pressure
Check the spark plug wire resis-
tance and check the spark plug
cap for corrosion or rust. (8-7)
Check the ignition spark using
the ignition tester. (8-7)
Check the ignition coil resis-
tance. (8-7)
Check the pulser coil output
peak voltage. (8-8)
Replace the ignition coil.
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 or liquids away,
since this test can produce sparks.
Good spark?
Yes
No
Within
specification?
No
Yes
Good condition?
Replace the spark plug wire.
No
Yes
Check the ECM output peak
voltage. (8-8)
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