Checking The Starter Motor; Electric Starter - Yamaha XJR1300 2007 Service Manual

EAS24790

CHECKING THE STARTER MOTOR

1. Check:
Commutator
G
Dirt → Clean with 600 grit sandpaper.
2. Measure:
Commutator diameter "a"
G
Out of specification → Replace the starter
motor.
Commutator diameter
28.0 mm (1.10 in)
Limit
27.0 mm (1.06 in)
a
3. Measure:
Mica undercut "a."
G
Out of specification → Scrape the mica to the
proper measurement with a hacksaw blade
that has been grounded to fit the commuta-
tor.
Mica undercut (depth)
0.70 mm (0.03 in)
NOTE:
The mica of the commutator must be undercut to
ensure proper operation of the commutator.
a
4. Measure:
Armature assembly resistances (commutator
G
and insulation)
Out of specification → Replace the starter
motor.

ELECTRIC STARTER

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a. Measure the resistance "1" and mica "2" re-
sistance with the pocket tester.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Armature coil
Commutator resistance "1"
0.002– 0.003 Ω 20°C
Insulation resistance "2"
Above 1 MΩ at 20°C (reference)
b. If any resistance is out of specification, re-
place the starter motor.
2
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5. Measure:
Brush length "a"
G
Out of specification → Replace the brushes
as a set.
Limit
5.00 mm (0.20 in)
6. Measure:
Brush spring force
G
Out of specification → Replace the brush
springs as a set.
5-35
1
a