Yamaha 30 HMHS [436/446] 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

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Yamaha 30 HMHS [436/446] Trouble shooting for peak voltage
TROUBLE SHOOTING FOR PEAK VOLTAGE
TRBL
ANLS
9-4
E
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 lead to ignition coil, CDI unit, pulser coil and charge coil.
NG
OK
Contamination, Loose connection
Corrosion
Clean,
Correct.
2) Check the spark gap.
NG
OK
Above specification Replace the spark plug.
3) Check the plug cap (resistance).
NG
OK
Out of specification Replace.
4) Check the ignition coils (resistance).
NG
OK
Out of specification Replace.
5) Check the CDI unit resistance and output peak voltage.
OK
NG
Above specification Replace the ignition coil.
6) Check the charge coil resistance and output peak voltage.
NG
OK
Below specification Replace the charge coil.
7) Check the pulser coil resistance and output peak voltage.
NG
OK
Below specification Replace the pulser coil.
Replace the CDI unit.

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