Checking The Starter Motor - Yamaha XC50V Service Manual

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ELECTRIC STARTING SYSTEM
EAS00769

CHECKING THE STARTER MOTOR

1. Check:
2. Measure:
3.
NOTE:
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
4. Measure:
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a. Measure the armature assembly resis-
b. If any resistance is out of specification, re-
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8-20
8 commutator
Dirt Clean with 600-grit sandpaper.
8 commutator diameter a
Out of specification
motor.
Commutator wear limit
16.6 mm (0.654 in)
Measure:
8 mica undercut a
Out of specification
to the proper measurement with a hack-
saw blade that has been grounded to fit
the commutator.
Mica undercut
1.35 mm (0.053 in)
8 armature assembly resistances (commu-
tator and insulation)
Out of specification
motor.
tances with the pocket tester.
Pocket tester
90890-03132 (YU-03112-C)
Armature coil
Commutator resistance 1 1 1 1 1
0.0378 ~ 0.0462 Ω Ω Ω Ω Ω at 20°C
Insulation resistance 2 2 2 2 2
Above 1 MΩ Ω Ω Ω Ω at 20°C
place the starter motor.
- +
ELEC
Replace the starter
Scrape the mica
Replace the starter