Checking The Starter Motor - Yamaha FZS1000N Service Manual

ELECTRIC STARTING SYSTEM
EAS00769

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.
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.
NOTE:
The mica must be undercut to ensure proper op-
eration 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.
8-24
ELEC
Commutator wear limit
27 mm (1.06 in)
Mica undercut
0.7 mm (0.03 in)
Pocket tester measurement
YU-03112-C
Armature coil
Commutator resistance 1
0.025 X 0.035 Ω at 20_C (68_F)
Insulation resistance 2
Above 1M Ω at 20_C (68_F)