Yamaha T135SE Service Manual page 312

STARTER MOTOR (T135SE)
2. Measure:
9 commutator diameter a
Out of specification → Replace the starter
motor.
Commutator wear limit
3. Measure:
9 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.
Mica undercut
NOTE:
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
4. Measure:
9 armature assembly resistances (commuta-
tor and insulation)
Out of specification → Replace the starter
motor.
a. Measure the armature assembly resis-
tances with the pocket tester.
Pocket tester
Armature coil
b. If any resistance is out of specification,
replace the starter motor.
8-20
http://www.motorcycle.in.th
ELEC
16.6 mm (0.65 in)
1.35 mm (0.05 in)
90890-03112
Commutator resistance
0.0315–0.0385 Ω at 20° C (68° F)
22
Insulation resistance
Above 1 M Ω at 20° C (68° F)
11