Checking The Starter Motor - Yamaha YJ50RAP Service Manual

STARTER MOTOR
EAS00769

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
14.8 mm (0.58 in)
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
1.15 mm (0.05 in)
NOTE:
@
The mica 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
YU-03112
7 - 19
– +
ELEC