Yamaha 2006 FZ1-N, Service Manual

Page: 240 / 451

ELECTRIC STARTER
5-42
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
→
Scrape the mica to
the proper measurement with a hacksaw
blade that has been grounded to fit the
commutator.
NOTE:
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
4. Measure:
• Armature assembly resistances (commuta-
tor and insulation)
Out of specification
→
Replace the starter
motor.
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Measure the armature assembly resis-
tances with the pocket tester.
b. If any resistance is out of specification,
replace 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 wear limit
27.0 mm (1.06 in)
Mica undercut
0.7 mm (0.03 in)
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Armature coil
Commutator resistance “1”
0.0250–0.0350
Ω
at 20
°
C (68
°
F)
Insulation resistance “2”
Above 1 M
Ω
at 20
°
C (68
°
F)
Brush length wear limit
5.0 mm (0.20 in)
Brush spring force
7.65–10.0 N
(780–1021 gf, 27.54–36.03 oz)