Troubleshooting Chart - Yamaha ULTRAMATIC KODIAK YFM400AP Owner's Manual

EBU00724

Troubleshooting chart

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 electrodes.
4. Battery
Use the electric starter.
Turn the fuel cock
There is fuel.
lever to "OFF".
Turn the fuel cock
Some fuel.
lever to "RES".
Supply fuel.
No fuel.
There is compression.
Compression normal.
Ask a Yamaha dealer to
No compression.
inspect.
Wet Wipe clean with dry cloth.
Attach spark plug cap and
Dry
ground to chassis.
Engine turns over
Battery is good.
quickly.
Engine turns over
Check the connections.
slowly.
Turn the fuel cock
lever to "ON".
Remove the fuel hose Check the
from the fuel cock. fuel flow.
Restart the engine.
Use the
electric starter.
8-125
No fuel.
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.
Fuel cock is
clogged.
Clean the
fuel cock.