Checking The Starter Motor - Yamaha VMX12 2001 Service Manual

STARTER MOTOR
EAS00770

CHECKING THE STARTER MOTOR

1. Check:
• commutator
Dirt → Clean with 600 grit sandpaper.
2. Measure:
• commutator diameter a
Out of specification → Replace the starter
motor.
Commutator wear limit
27 mm
3. Measure:
• 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
0.7 mm
NOTE:
@
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
@
4. Measure:
• 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
90890-03112
Armature coil
Commutator resistance 1
0.025 ~ 0.035 Ω at 20 °C
Insulation resistance 2
Above 1 MΩ at 20 °C
b. If any resistance is out of specification,
replace the starter motor.
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