Yamaha YZF-R1 (2006) [244/426] Electric starter

Yamaha YZF-R1 (2006) [244/426] Electric starter
ELECTRIC STARTER
5-41
EAS24790
CHECKING THE STARTER MOTOR
1. Check:
•Commutator
Dirt Clean with 1000 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.
Limit
23.5 mm (0.93 in)
Mica undercut (depth)
1.50 mm (0.06 in)
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Armature coil
Commutator resistance “1”
0.009–0.011 at 20°C (68°F)
Insulation resistance “2”
Above 1 M at 20°C (68°F)
Limit
7.19 mm (0.28 in)
Brush spring force
5.28–7.92 N (19.01–28.51 oz)
(538–808 gf)

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