Yamaha YZF-R125 Service Manual: Circuit diagram

Circuit diagram


4. Main fuse

5. Main switch

6. Radiator fan motor fuse

9. Battery

22.Coolant temperature sensor

32.Radiator fan motor relay

33.Radiator fan motor

59.Coolant temperature warning light

64.Ignition fuse

66.Signaling system fuse

    Cooling system
    ...

    Troubleshooting
    NOTE: Before troubleshooting, remove the following part(s): 1. Rider seat 2. Fuel tank 3. Right upper side cowling 4. Passenger seat ...

    Other materials:

    Troubleshooting
    Although Yamaha motorcycles receive a thorough inspection before shipment from the factory, trouble may occur during operation. Any problem in the fuel, compression, or ignition systems, for example, can cause poor starting and loss of power. The following troubleshooting charts repre ...

    Electrical components
    1. Main switch 2. Clutch switch 3. Front brake light switch 4. Ignition coil 5. Throttle body sensor assembly (intake air pressure sensor, intake air temperature sensor, throttle position sensor) 6. FID (fast idle solenoid) 7. Rectifier/regulator 8. Lean angle sensor 9. Starting circui ...

    Checking the speed sensor
    1. Check: Speed sensor output voltage Out of specification → Replace. a. Connect the pocket tester (DC 20 V) to the speed sensor coupler (wire harness end) as shown. Positive tester probe gray "1" Negative tester probe gray/black "2" b. Set the main switch to "ON". c. ...

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