Checking The Starter Motor - Yamaha Vmax VMX17C 2009 Service Manual

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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.
Limit
27.0 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 (depth)
1.00 mm (0.04 in)
TIP
The mica of the commutator must be undercut to
ensure proper operation of the commutator.
4. Measure:
• Armature assembly resistance (commutator
and insulation)
Out of specification → Replace the starter
motor.
M
MMM
M MMM
M
M MMM
M
M MMM
M
a. Measure the armature assembly resistance
with the digital circuit tester.
M MMM
M
M MMM
M
MMM
5-46
ELECTRIC STARTER
Digital circuit tester
90890-03174
Model 88 Multimeter with ta-
chometer
YU-A1927
Armature coil
Commutator resistance "1"
Continuity (0.0081–0.0099 Ω at
20 °C (68 °F))
Insulation resistance "2"
No continuity (Above 1 MΩ at 20
°C (68 °F))
b. If any resistance is out of specification, re-
place the starter motor.
L
LLL
L LLL
L
L LLL
L
L LLL
L
5. Measure:
• Brush length "a"
Out of specification → Replace the brushes
as a set.
Limit
7.60 mm (0.30 in)
6. Measure:
• Brush spring force
Out of specification → Replace the brush
springs as a set.
Brush spring force
7.36–11.04 N (750–1126 gf,
26.49–39.74 oz)
L LLL
L
L LLL
L
LLL

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Vmax vmx17y 20092009 vmx17yc

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