Yamaha YZF-R125 Service Manual: Troubleshooting

  • Any of the following fail to light: turn signal lights, brake light or indicator lights.
  • The horn fails to sound.
  • The fuel gauge fails to operate.
  • The speedometer fails to operate.

NOTE:

  • Before troubleshooting, remove the following part(s):

1. Seats

2. Fuel tank

3. Left upper side cowling

4. Right side panel

5. Left lower side cowling

Troubleshooting


Troubleshooting


Troubleshooting


    Circuit diagram
    4. Main fuse 5. Main switch 9. Battery 14.Neutral switch 25.ECU (engine control unit) 31.Fuel sender 34.Rear brake light switch 35.Front brake light switch 37.Tail/brake light 38.Rear rig ...

    Cooling system
    ...

    Other materials:

    Measuring the compression pressure
    NOTE: Insufficient compression pressure will result in a loss of performance. 1. Measure: Valve clearance Out of specification →Adjust. Refer to "ADJUSTING THE VALVE CLEARANCE" on page 3-3. 2. Start the engine, warm it up for several minutes, and then turn it off. 3. Remove: ...

    Checking the timing chain and timing chain guide
    1. Check: Timing chain Damage/stiffness Replace the timing chain and camshaft sprocket as a set. 2. Check: Timing chain guide (intake side) Damage/wear Replace. Checking the oil strainer 1. Check: Oil strainer Damage   Replace. Contaminants Clean with solvent. ...

    Handlebar switches
    Left Left 1. Pass switch "PASS" 2. Dimmer switch "/" 3. Turn signal switch "/" 4. Horn switch"" Right Right Engine stop switch "/" Start switch"" Pass switch "PASS" Press this switch to flash the headlight. Dimmer switch "/" Set this switch to"" for the high beam an ...

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