Yamaha YZF-R125 Service Manual: Electrical components

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 circuit cut-off relay

10.Turn signal relay

11.Radiator fan motor relay

12.Headlight relay

13.ECU (engine control unit)

14.Fuse box

15.Starter relay

16.Battery

17.Rear brake light switch

18.Sidestand switch

19.Neutral switch

20.Crankshaft position sensor

21.Coolant temperature sensor

22.Speed sensor

23.Radiator fan

24.Horn

Troubleshooting
If the fuel pump fails to operate. NOTE: Before troubleshooting, remove the following part(s): 1. Rider seat 2. Fuel tank ...

Checking the switches
1. Clutch switch 2. Main switch 3. Front brake light switch 4. Sidestand switch 5. Rear brake light switch 6. Neutral switch 7. Turn signal switch 8. Horn switch 9. Dimmer switch 10.Pass ...

Other materials:

Disassembling the front fork legs
The following procedure applies to both of the front fork legs. 1. Remove: Rubber cap Clip "1" Front fork cap "2" (with O-ring) Fork spring NOTE: Push the front fork cap in the direction of the arrow shown in the illustration to remove the clip. 2. Drain: Fork oil NOTE ...

Installing the radiator
1. Fill: Cooling system (with the specified amount of the recommended coolant) Refer to "CHANGING THE COOLANT" on page 3-15. 2. Check: Cooling system Leaks Repair or replace any faulty part. 3. Measure: Radiator cap opening pressure Below the specified pressure Repla ...

Checking the rocker arms and rocker arm shafts
The following procedure applies to all of the rocker arms and rocker arm shafts. 1. Check: Rocker arm Damage/wear Replace. 2. Check: Rocker arm shaft Blue discoloration/excessive wear/pitting/ scratches  Replace or check the lubrication system. 3. Measure: Rocke ...

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