Troubleshooting Charts - Yamaha WR125R Owner's Manual

Troubleshooting charts

Starting problems or poor engine performance
1. Fuel
Check the fuel level in
the fuel tank.
2. Compression
Operate the electric starter.
3. Ignition
Remove the spark plug
and check the electrodes.
4. Battery
Operate the electric starter.
PERIODIC MAINTENANCE AND ADJUSTMENT
There is enough fuel. Check the compression.
Supply fuel.
There is no fuel.
There is compression. Check the ignition.
Have a Yamaha dealer
There is no compression.
check the vehicle.
Wipe off with a dry cloth and correct the
Wet
spark plug gap, or replace the spark plug.
Dry Have a Yamaha dealer check the vehicle.
The engine turns over
The battery is good.
quickly.
Check the electrolyte and battery
The engine turns over
lead connections, and charge the
slowly.
battery if necessary.
6-37
The engine does not start.
Check the compression.
Operate the electric starter.
The engine does not start.
Check the battery.
The engine does not start.
Have a Yamaha dealer
check the vehicle.
EAUM2441
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