Checking The Starter Motor - Yamaha XV19SX(C) Service Manual

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
27.5 mm (1.08 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)
1.50 mm (0.06 in)
NOTE:
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.
M MMM M MMM M M MMM M M MMM M
a. Measure the armature assembly resistances
with the pocket tester.
M MMM M M MMM M MMM
5-84
ELECTRIC STARTER
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Armature coil
Commutator resistance "1"
0.0081–0.0099 Ω at 20 °C (68 °F)
Insulation resistance "2"
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
5.00 mm (0.20 in)
6. Measure:
• Brush spring force
Out of specification → Replace the brush
springs as a set.
Brush spring force
7.36–11.04 N (26.49–39.74 oz)
(750–1126 gf)
L LLL L L LLL L LLL