Checking The Starter Motor - Yamaha XP500 2001 Service Manual

ELECTRIC STARTING SYSTEM
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.
3. Measure:
S mica (insulation) undercut a
Out of specification ! Scrape the mica (in-
sulation) to the proper measurement with a
hacksaw blade which has been grounded to
fit the commutator.
NOTE:
The mica (insulation) of the commutator must
be undercut to ensure proper operation of the
commutator.
4. Measure:
S armature coil resistances (continuity and in-
sulation)
Out of specification ! Replace the starter
motor.
a. Check the continuity resistance 1 and mica
(insulation) resistances 2 with a pocket tes-
ter.
b. Measure the armature coil resistances.
c. If any resistance is out of specification, re-
place the starter motor.
8-25
ELEC
Commutator wear limit
27 mm
Mica (insulation) undercut
0.7 mm
Pocket tester
90890-03112
Armature coil continuity resistance
0.015 X 0.025 Ω at 20_C
Armature coil insulation resistance
Above 1MΩ at 20_C