Checking The Starter Motor - Yamaha YXR70FX Service Manual

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STARTER MOTOR
EBS01064

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 (1.06 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
0.70 mm (0.03 in)
TIP:
_
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
4. Measure:
• armature assembly resistances
(commutator and insulation)
Out of specification → Replace the starter
motor.
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