Yamaha YZF-R125 Service Manual: Starting circuit cut-off system operation

Yamaha YZF-R125 Service Manual / Electrical system / Electric starting system / Starting circuit cut-off system operation

If the engine stop switch is set to " " and the main switch is set to
"ON" (both switches are closed), the starter motor can only operate if at least one of the following conditions is met:

  • The transmission is in neutral (the neutral switch is closed).
  • The clutch lever is pulled to the handlebar (the clutch switch is closed) and the sidestand is up (the sidestand switch is closed).

The starting circuit cut-off relay prevents the starter motor from operating when neither of these conditions has been met. In this instance, the starting circuit cut-off relay is open so current cannot reach the starter motor. When at least one of the above conditions has been met, the starting circuit cut-off relay is closed and the engine can be started by pressing the start switch " 
".

Starting circuit cut-off system operation


a. WHEN THE TRANSMISSION IS IN NEUTRAL

b. WHEN CLUTCH LEVER IS PULLED TO THE HANDLEBAR AND THE SIDESTAND IS UP

1. Battery

2. Main fuse

3. Main switch

4. Ignition fuse

5. Engine stop switch

6. Starting circuit cut-off relay

7. Clutch switch

8. Sidestand switch

9. Diode

10.Neutral switch

11.Start switch

12.Starter relay

13.Starter motor

    Circuit diagram
    4. Main fuse 5. Main switch 7. Clutch switch 8. Sidestand switch 9. Battery 10.Starter relay 11.Starter motor 12.Starting circuit cut-off relay 13.Diode 14.Neutral switch 16.Start switch ...

    Troubleshooting
    The starter motor fails to turn. NOTE: Before troubleshooting, remove the following part(s): 1. Seats 2. Fuel tank 3. Left lower side cowling 4. Left upper side cowling ...

    Other materials:

    Checking the rear brake caliper
    1. Check: Brake caliper piston "1" Rust/scratches/wear Replace the brake caliper piston. Brake caliper cylinder "2" Scratches/wear Replace the brake caliper assembly. Brake caliper body "3" Cracks/damage   Replace the brake caliper assembly. Brake fluid deli ...

    Checking and lubricating the cables
    The operation of all control cables and the condition of the cables should be checked before each ride, and the cables and cable ends should be lubricated if necessary. If a cable is damaged or does not move smoothly, have a Yamaha dealer check or replace it. WARNING! Damage to the out ...

    Checking the lean angle sensor
    1. Remove: Lean angle sensor 2. Check: Lean angle sensor output voltage Out of specification Replace. a. Connect the lean angle sensor to the wire harness. b. Connect the pocket tester (DC 20 V) to the lean angle sensor coupler as shown. Positive tester probe yellow/green "1" Neg ...

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