Yamaha DT125X Owner's Manual download pdf (Page 61)

EAU25921

Troubleshooting charts

Starting problems or poor engine performance

EWA10840

WARNING

Keep away open flames and do not smoke while checking or working on the fuel system.

PERIODIC MAINTENANCE AND MINOR REPAIR

6-30

Check the fuel level in

the fuel tank.

1. Fuel

There is enough fuel.

There is no fuel.

Check the compression.

Supply fuel.

The engine does not start.

Check the compression.

Operate the electric starter.

2. Compression

There is compression.

There is no compression.

Check the ignition.

Have a Yamaha dealer

check the vehicle.

Remove the spark plug

and check the electrodes.

3. Ignition

Wipe off with a dry cloth and correct the

spark plug gap, or replace the spark plug.

Have a Yamaha dealer check the vehicle.

The engine does not start.

Have a Yamaha dealer

check the vehicle.

The engine does not start.

Check the battery.

Operate the electric starter.

4. Battery

The engine turns over

quickly.

The engine turns over

slowly.

The battery is good.

Check the battery lead connections,

and charge the battery if necessary.

Dry

Wet

Open the throttle halfway and operate

the electric starter.

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Yamaha DT125X Owner's Manual Page 61

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