Checking The Starter Motor - Yamaha XN125 2000 Service Manual

STARTER MOTOR
EAS00770

CHECKING THE STARTER MOTOR

1. Check:
• commutator
Dirt → Clean with 600 grit sandpaper.
2. Measure:
• commutator diameter a
Out of specification → Replace the starter
a
motor.
3. Measure:
a
• mica undercut a
Out of specification → Scrape the mica to the
proper measurement with a hacksaw blade
which has been ground 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, re-
place the starter motor.
8-16
ELEC
Commutator diameter
22 mm
<Limit>: 21 mm
Mica undercut
1.5 mm
Pocket tester
90890-03112
Armature coil
Commutator resistance
Ω
0.0306 ~ 0.0374
Insulation resistance
Ω
Above 1 M at 20
°
at 20 C
°
C