Checking The Starter Motor - Yamaha XVS250 2001 Service Manual

ELECTRIC STARTING SYSTEM
EAS00769

CHECKING THE STARTER MOTOR

1. Check:
D commutator
Dirt  Clean with 600 grit sandpaper.
2. Measure:
D commutator diameter a
Out of specification  Replace the starter
motor.
3. Measure:
D mica undercut a
Out of specification  Scrape the mica to the
proper measurement with a hacksaw blade
which has been grounded to fit the commuta-
tor.
NOTE:
The mica must be undercut to ensure proper op-
eration of the commutator.
4. Measure:
D armature assembly resistances (commuta-
tor and insulation)
Out of specification  Replace the starter
motor.
a. Measure
tances with the pocket tester.
b. If any resistance is out of specification, re-
place the starter motor.
7-20
ELEC
Min. commutator diameter
21 mm
Mica undercut
1.5 mm
the armature assembly resis-
Pocket tester
90890-03112
Armature assembly
Armature coil resistance 1
0.0171 X 0.0209 Ω at 20_C
Insulation resistance 2
Above 1 MΩ at 20_C