Yamaha F80B Service Manual page 231

Ignition system
Check the ignition spark using
the ignition tester. (8-7)
Good spark?
No
Check the ignition coil resis-
tance. (8-7)
Within
specification?
Yes
Check the spark plug wire resis-
tance and check the spark plug
cap for corrosion or rust. (8-7)
Good condition?
Yes
Check the ECM output peak
voltage. (8-8)
Compression pressure
Check that there is no secondary air intake on the contact surfaces of
the intake manifold and cylinder head.
Is there air
intake?
No
Check the compression pres-
sure of the combustion chamber.
6D93G11
Yes
Check the pulser coil output
peak voltage. (8-8)
No
Replace the ignition coil.
No
Replace the spark plug wire.
Yes
Replace the defective seals.
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.
Power unit
1
2
3
4
5
6
7
8
9
9-10