Yamaha XVS950CU 2014, Service Manual

Page: 354 / 580

ELECTRIC STARTER
5-63
EAS24790
CHECKING THE STARTER MOTOR
1. Check:
• Commutator
Dirt
→
Clean with 600 grit sandpaper.
2. 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.
TIP
The mica of the commutator must be undercut to
ensure proper operation of the commutator.
3. 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.
▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲▲▲
4. Measure:
• Brush length “a”
Out of specification
→
Replace the brush set
assembly.
5. Measure:
• Brush spring force
Out of specification
→
Replace the brush set
assembly.
6. Check:
• Gear teeth
Damage/wear
→
Replace the starter motor.
Mica undercut (depth)
0.70 mm (0.03 in)
Digital circuit tester
90890-03174
Model 88 Multimeter with ta-
chometer
YU-A1927
Armature coil
Commutator resistance “1”
Continuity (0.0050–0.0150
Ω
at
20 °C (68 °F))
Insulation resistance “2”
No continuity (Above 1 M
Ω
at 20
°C (68 °F))
Brush overall length
12.0 mm (0.47 in)
Limit
6.50 mm (0.26 in)
Brush spring force
6.025–6.515 N (614–664 gf,
21.69–23.45 oz)