Troubleshooting Chart - Yamaha TTR 125 2020 Owner's Manual

Periodic maintenance and adjustment

Troubleshooting chart

1. Fuel
Check the fuel level in
the fuel tank.
2. Battery
Operate the electric starter.
7
3. Ignition
Remove the spark plug
and check the electrodes.
4. Compression
Try starting the engine.
There is enough fuel. Check the battery.
There is no fuel. Supply fuel.
The engine turns over
The battery is good.
quickly.
The engine turns over Check the battery lead connections,
slowly. and charge the battery if necessary.
Wipe off with a dry cloth and correct the
Wet
spark plug gap, or replace the spark plug(s).
Have a Yamaha dealer check the vehicle.
Dry
The engine does not start.
There is compression.
Have a Yamaha dealer check the vehicle.
Have a Yamaha dealer check the vehicle.
There is no compression.
7-33
The engine does not start.
Check the battery.
The engine does not start.
Check the ignition.
Open the throttle halfway and try
starting the engine.
The engine does not start.
Check the compression.
EAU25905