Yamaha YZF-R125 Service Manual: Cable routing

Cable routing


  1. Front brake light switch lead
  2. Right handlebar switch lead
  3. Throttle cable
  4. Main switch
  5. Clutch cable
  6. Clutch switch lead
  7. Left handlebar switch lead
  8. Sub-wire harness
  9. Horn
  10. Speed sensor lead
  11. Front brake hose
  12. Main switch lead
  13. Left headlight assembly lead
  14. Right headlight assembly lead

A. Route the right handlebar switch lead to the rear the front brake hose.

B. Route the throttle cable in front of the front brake light switch lead.

C. Pass the throttle cable through the guide.

D. Connect the horn connectors to the horn terminals as shown in the illustration.

E. Secure the plastic locking tie by inserting the projection on the tie into the hole in the front brake pipe bracket, and then fasten the speed sensor lead with the tie.

F. Pass the front brake light switch lead between the throttle cable and the front brake hose.

G. Fasten the left headlight assembly lead and subwire harness to the right headlight body with a plastic locking tie as shown in the illustration, making sure to align the white tape on the lead and harness with the tie.

H. Fasten the left headlight assembly lead, right headlight assembly lead, and sub-wire harness with a plastic locking tie, making sure to align the white tape on the leads and harness with the tie.

Cable routing


  1. Throttle body
  2. Wire harness
  3. Ignition coil
  4. Spark plug lead
  5. Sub-wire harness
  6. Front brake light switch lead
  7. Throttle cable
  8. Right handlebar switch lead
  9. Right headlight assembly lead
  10. Left headlight assembly lead
  11. Front brake hose
  12. Main switch lead
  13. Speed sensor lead
  14. Radiator inlet hose
  15. Radiator fan motor lead
  16. Wire harness (to coolant temperature sensor)
  17. Starter motor
  18. Front turn signal light lead

A. Cover the sub-wire harness couplers with the coupler cover.

B. Fasten the wire harness and sub-wire harness to the guide with a plastic locking tie.

C. After connecting the wire harness to the left and right headlight assembly leads, cover the couplers with the coupler cover, and then fasten a plastic locking tie around the end of the cover as shown in the illustration.

D. Fasten the grommet on the speed sensor lead with the holder.

Cable routing


  1. Battery breather hose
  2. Wire harness
  3. Starter motor lead
  4. Rear brake light switch lead
  5. Rear brake hose

A. Fasten the battery breather hose with the holder.

Cable routing


  1. Front brake hose
  2. Throttle cable
  3. Left handlebar switch lead
  4. Clutch cable
  5. Wire harness (to horn)
  6. Ignition coil
  7. Air filter case silencer hose
  8. Sidestand switch lead
  9. Coolant reservoir hose
  10. Fuel tank breather hose
  11. Coolant reservoir breather hose
  12. Front left turn signal light coupler
  13. Speed sensor lead
  14. Wire harness (to clutch switch)
  15. Front left turn signal light lead
  16. Horn
  17. Fuel hose
  18. Fuel pump lead
  19. Fuel sender lead

A. Fasten the left handlebar switch lead, wire harness (to clutch switch), and clutch cable with a plastic locking tie, making sure to align the white tape on the leads and cable with the tie.

B. Fasten the sidestand switch lead, coolant reservoir hose, and fuel tank breather hose with the plastic clamp.

C. Fasten the sidestand switch lead, coolant reservoir hose, and fuel tank breather hose to the left side cowling bracket with the plastic clamp.

D. Fasten the wire harness (to clutch switch) and left handlebar switch lead to the left radiator bracket with a plastic locking tie, making sure to align the white tape on the harness and lead with the tie, and then route the harness and lead to the inside of the clutch cable guide.

E. Fasten the grommet on the front brake hose with the holder.

F. Route the throttle cable to the inside of the radiator bracket and pass the cable through the guide on the radiator cover.

Cable routing


  1. Air filter case silencer hose
  2. Wire harness
  3. Battery
  4. Lean angle sensor
  5. Tail/brake light lead
  6. Sidestand switch lead
  7. Neutral switch
  8. Crankshaft position sensor/stator coil lead
  9. Negative battery lead
  10. Rectifier/regulator
  11. Ground lead terminal
  12. Rear right turn signal light lead
  13. License plate light lead
  14. Rear left turn signal light lead
  15. Wire harness (to neutral switch)

A. Fasten the wire harness at the white tape with a plastic locking tie.

B. Fasten the license plate light lead, rear left turn signal light lead, and rear right turn signal light lead to the rear fender stay with plastic locking ties, making sure to align the white tape on the leads with the ties.

C. Route the fuel tank breather hose and coolant reservoir breather hose so that the end of each hose is positioned further rearward than the sidestand pivoting point as shown in the illustration.

D. Pass the wire harness (to neutral switch) through the guide on the left crankcase, making sure to align the white tape on the harness with the guide as shown in the illustration.

E. 50-90 F. 100 mm (3.94 in) G. Fasten the sidestand switch lead at the white tape with the holder.

H. 65 mm (2.56 in)

Cable routing


  1. Coolant reservoir hose
  2. Radiator inlet hose
  3. Spark plug lead
  4. Wire harness
  5. FID (fast idle solenoid) lead
  6. Fuel injector lead
  7. Rear brake light switch lead
  8. Throttle body sensor assembly
  9. Ignition coil leads
  10. Air filter case silencer hose
  11. Wire harness (to horn)
  12. Clutch cable
  13. Throttle cable
  14. Wire harness (to left handlebar switch)
  15. Front brake light switch lead
  16. Right handlebar switch lead
  17. Main switch lead
  18. Cylinder head breather hose

A. Fasten the wire harness with the plastic locking tie.

B. Fasten the fuel injector lead and FID (fast idle solenoid) lead with a plastic locking tie.

C. Pass the clutch cable through the guide.

D. Secure the plastic locking tie by inserting the projection on the tie into the hole in the frame.

Cable routing


  1. Positive battery lead
  2. Starter relay
  3. Radiator fan motor relay
  4. Turn signal relay
  5. Lean angle sensor
  6. Rear right turn signal light lead
  7. License plate light lead
  8. Rear left turn signal light lead
  9. Tail/brake light lead
  10. Starting circuit cut-off relay
  11. Headlight relay
  12. ECU (engine control unit)
  13. Wire harness
  14. Fuse box
  15. Negative battery lead
  16. Battery

A. Fasten the wire harness with a plastic locking tie.

B. Fasten the tail/brake light coupler to the frame with a plastic locking tie.

C. Fasten the license plate light lead, rear right turn signal light lead, rear left turn signal light lead, and wire harness with a plastic locking tie.

    Cooling system diagrams
    Radiator inlet hose Coolant reservoir hose Radiator cap Radiator Coolant reservoir breather hose Coolant reservoir Water pump breather hose Water pump Radiator outlet hose ...

    Periodic checks and adjustments
    ...

    Other materials:

    Checking the horn
    1. Check: Horn resistance Out of specification Replace. a. Disconnect the horn connectors from the horn terminals. b. Connect the pocket tester ( × 1) to the horn terminals. Positive tester probe horn terminal "1" Negative tester probe horn terminal "2" c. Measure t ...

    Starting the engine
    In order for the ignition circuit cut-off system to enable starting, one of the following conditions must be met: The transmission is in the neutral position. The transmission is in gear with the clutch lever pulled and the sidestand up. 1. Turn the key to "ON" and make sure ...

    Installing the primary drive gear and balancer gears
    1. Install: Balancer driven gear "1" Lock washer Balancer drive gear "2" Primary drive gear Washer "3" Balancer driven gear nut Primary drive gear nut NOTE: Align the punch mark "a" in the balancer drive gear "2" with the punch mark "b" in the balancer driven gear "1". ...

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