Yamaha Raptor 700R 2009, Service Manual

Page: 231 / 374

ELECTRIC STARTER
5-38
EAS24790
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.
3. Measure:
• Mica undercut “a”
Out of specification
→
Cut the mica to the
proper measurement with a hacksaw blade
that has been grounded to fit the commutator.
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.
▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼▼▼
a. Measure the armature assembly resistances
with the pocket tester.
b. If any resistance is out of specification, re-
place the starter motor.
▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲▲▲
5. Measure:
• Brush length “a”
Out of specification
→
Replace the brushes
as a set.
6. Measure:
• Brush spring force
Out of specification
→
Replace the brush
springs as a set.
Commutator diameter
28.0 mm (1.10 in)
Limit
27.0 mm (1.06 in)
Mica undercut (depth)
0.70 mm (0.03 in)
a
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Armature coil
Commutator resistance “1”
0.025–0.035
Ω
at 20 °C (68 °F)
Insulation resistance “2”
Above 1 M
Ω
at 20 °C (68 °F)
Brush overall length
12.5 mm (0.49 in)
Limit
5.00 mm (0.20 in)