Checking The Starter Motor - Yamaha YZF-R1S Service Manual

STARTER MOTOR
EAS00770

CHECKING THE STARTER MOTOR

1. Check:
S commutator
Dirt ! Clean with 600 grit sandpaper.
2. Measure:
S commutator diameter a
Out of specification ! Replace the starter
motor.
Commutator wear limit
24.5 mm (0.96 in)
3. Measure:
S mica undercut a
Out of specification ! Scrape the mica to the
proper measurement with a hacksaw blade
that has been grounded to fit the commuta-
tor.
Mica undercut
1.5 mm (0.06 in)
NOTE:
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
4. Measure:
S armature assembly resistances (commuta-
tor and insulation)
Out of specification ! Replace the starter
motor.
a. Measure the armature assembly resistances
with the pocket tester.
Pocket tester
90890-03112, YU-3112
Armature coil
Commutator resistance 1
0.0090 X 0.0110 Ω
at 20_C (68_F)
Insulation resistance 2
Above 1 MΩ at 20_C (68_F)
b. If any resistance is out of specification, re-
place the starter motor.
8-21
ELEC