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.

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:

Coolant
The coolant level should be checked before each ride. In addition, the coolant must be changed at the intervals specified in the periodic maintenance and lubrication chart. To check the coolant level Place the vehicle on a level surface and hold it in an upright position. TIP ...

Checking the clutch housing
1. Check: Clutch housing dogs "1" Damage/pitting/wear Deburr the clutch housing dogs or replace the clutch housing. NOTE: Pitting on the clutch housing dogs will cause erratic clutch operation. 2. Check: Bearing Damage/wear Replace the bearing and clutch housin ...

Adjusting the engine idling speed
NOTE: Prior to adjusting the engine idling speed, the air filter element should be clean, and the engine should have adequate compression. 1. Start the engine and let it warm up for several minutes. 2. Remove: Rider seat Refer to "GENERAL CHASSIS" on page 4-1. 3. Lift the fuel tank. ...