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:

    Cable routing
    Front brake light switch lead Right handlebar switch lead Throttle cable Main switch Clutch cable Clutch switch lead Left handlebar switch lead Sub-wire harness Horn Speed sensor lead Front brake hose Main switch lead Left headlight assembly lead Right headlight asse ...

    Checking the rectifier/regulator
    1. Check: Rectifier/regulator output voltage Out of specification → Replace the rectifier/ regulator. a. Set the engine tachometer to the spark plug lead. b. Connect the pocket tester (DC 20 V) to the rectifier/regulator coupler as shown. Positive tester probe red "1" Negat ...

    Checking the speed sensor
    1. Check: Speed sensor output voltage Out of specification → Replace. a. Connect the pocket tester (DC 20 V) to the speed sensor coupler (wire harness end) as shown. Positive tester probe gray "1" Negative tester probe gray/black "2" b. Set the main switch to "ON". c. ...

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