Yamaha F6AMH, Service Manual

Page: 498 / 510

TROUBLE SHOOTING FOR PEAK VOLTAGE
TROUBLE SHOOTING FOR PEAK VOLTAGE
Items Symptoms
1. Poor starting No firing. The starter motor cranks the engine, but no firing takes
place in the cylinder.
Firing takes place in the cylinder, but the engine stops soon.
Start-up time is too long. The engine will not start-up easily.
2. Unstable idling
speed The engine speed is not stable at idle.
The engine stalls when the throttle lever is opened.
The engine stalls after it is warmed-up.
3. Unstable engine
speed The engine does not run smoothly.
The engine speed drops during acceleration.
Check the ignition system.
1) Check the harness couplers toignition coil, CDI unit, pulser coil, and charge coil.
2) Check the spark gap.
3) Check the plug cap.
4) Check the ignition coils.
5) Check the CDI unit output peak voltage.
6) Check the charge coil output peak voltage.
7) Check the pulser coil output peak voltage.
Replace the CDI Unit.
OK
NG
OK
OK
NG
OK
OK
NG
OK
NG
NG
OK
NG
NG
Contamination, Loose connection
Corrosion
Above specification
Out of specification
Out of specification
Above specification
Below specification
Below specification
Clean
Correct
Replace the spark plug.
Replace
Replace
Replace the ignition coil.
Replace the charge coil.
Replace the pulser coil.
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