Yamaha FZ6RC, Service Manual, Page: 236 / 420

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
→
Scrape the mica to the
proper measurement with a hacksaw blade
that has been grounded to fit the commuta-
tor.
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.
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a. Measure the armature assembly resistances
with the digital circuit 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.
Limit
28.0 mm (1.10 in)
Mica undercut (depth)
0.70 mm (0.03 in)
Digital circuit tester
90890-03174
Model 88 Multimeter with tachom-
eter
YU-A1927
Armature coil
Commutator resistance “1”
0.0012 – 0.0022
Ω Ω Ω Ω
at 20
°°°°
C (68
°°°°
F)
Insulation resistance “2”
Above 1M
Ω Ω
Ω Ω
at 20
°°°°
C (68
°°°°
F)
Limit
3.50 mm (0.14 in)
Brush spring force
7.16 – 9.52 N (730 – 971 gf,
25.77 – 34.27 oz)