Yamaha YZF-R125 Service Manual: Checking the starter motor

Yamaha YZF-R125 Service Manual / Engine / Electric starter / Checking the starter motor

1. Check:

  • Commutator Dirt Clean with 600 grit
    sandpaper.

2. Measure:

  • Commutator diameter "a" Out of specification Replace
    the starter motor.

Checking the starter motor


3. Measure:

  • Mica undercut "a" Out of specification Scrape
    the mica to the proper measurement with a hacksaw blade that has been grounded to fit the commutator.

NOTE:

The mica of the commutator must be undercut to ensure proper operation of the commutator.


4. Measure:

  • Armature assembly resistances (commutator and insulation) Out of specification Replace
    the starter motor.

a. Measure the armature assembly resistances with the pocket tester.


b. If any resistance is out of specification, replace the starter motor.

Checking the starter motor


5. Measure:

  • Brush length "a" Out of specification Replace
    the starter motor front cover/brush holder set.

Checking the starter motor


6. Measure:

  • Brush spring force Out of specification Replace
    the brush springs as a set.

7. Check:

Gear teeth Damage/wear  Replace the gear.


8. Check:

  • Bearing
  • Oil seal
  • Damage/wear Replace the
    starter motor front cover/brush holder set.
    Electric starter
    ...

    Assembling the starter motor
    1. Install: Starter motor front cover/brush holder set "1" Starter motor yoke "2" NOTE: Align the marks "a" on the starter motor yoke and starter motor front cover/brush holder set. ...

    Other materials:

    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 ...

    Troubleshooting
    The ignition system fails to operate (no spark or intermittent spark). NOTE: Before troubleshooting, remove the following part(s): 1. Seats 2. Fuel tank 3. Right side cover 4. Left side panel 5. Left upper side cowling ...

    Setting the normal mode
    NOTE: The engine speed, coolant temperature, and fault code, if detected, can be displayed on the LCD of the FI diagnostic tool when the tool is connected to the vehicle and is set to the normal mode. 1. Set the main switch to "OFF" and the engine stop switch to "". 2. Disconnect the self- ...

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