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:

    Adjusting the clutch lever free play
    Adjusting the clutch lever free play Clutch lever free play adjusting bolt Clutch lever free play The clutch lever free play should measure 10.0-15.0 mm (0.39-0.59 in) as shown. Periodically check the clutch lever free play and, if necessary, adjust it as follows. Slide the ...

    Checking the crankshaft
    1. Measure: Crankshaft runout Out of specification Replace the crankshaft, bearing or both. NOTE: Turn the crankshaft slowly. 2. Measure: Big end side clearance Out of specification Replace the crankshaft. 3. Measure: Crankshaft width Out of specification&nbs ...

    Checking the turn signal relay
    1. Check: Turn signal relay input voltage Out of specification →The wiring circuit from the main switch to the turn signal relay coupler is faulty and must be repaired. a. Connect the pocket tester (DC 20 V) to the turn signal relay terminal as shown. - Positive tester probe  b ...

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