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Troubleshooting charts
Starting problems or poor engine performance
1. Fuel
Check if there is fuel
in the fuel tank.
2. Compression
Use the electric
starter to see if
there is compression.
3. Ignition
Remove the
spark plug and
check the electrodes.
4. Battery
Use the electric starter.
Remove the fuel hose
There is fuel.
from the fuel pump.
Supply fuel.
No fuel.
There is compression.
Compression normal.
Ask a Yamaha dealer to
No compression.
inspect.
Wipe clean with dry cloth.
Wet
Attach spark plug cap and
Dry
ground to chassis.
Engine turns over
Battery is good.
quickly.
Engine turns over
Check the connections,
recharge.
slowly.
Check the
No fuel.
fuel flow.
Restart the engine.
Use the
electric starter.
8-139
Fuel pump is
clogged.
Ask a Yamaha dealer to
inspect.
Ignition system is
Spark is good.
normal.
Spark is weak.
Adjust the spark plug gap
No spark.
or replace the spark plug.
Ask a Yamaha dealer to
inspect.
EVU01540
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