Yamaha YFM660FS, Supplementary Service Manual

Page: 436 / 478

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ELEC
ELECTRIC STARTING SYSTEM
CHECKING THE STARTER MOTOR
1.Inspect:
●
Commutator
Dirty
→
Clean it with #600 grit sandpaper.
2.Measure:
●
Commutator diameter
a
Out of specification
→
Replace the starter
motor.
3.Measure:
●
Mica undercut
b
Out of specification
→
Scrape the mica using
a hacksaw blade.
NOTE:
Scrape the mica to the proper measurement
using a hacksaw blade which has been
grounded to fit the commutator.
Outside diameter:
28 mm (1.10 in)
<Wear limit:>
27 mm (1.06 in)
Mica undercut:
0.7 mm (0.03 in)
4.Inspect:
●
Armature coil (insulation/continuity)
Defects
→
Replace the starter motor.
*****************************************************
Inspection steps:
●
Connect the pocket tester for the continuity
check
1
and insulation check
2
.
●
Measure the armature resistances.
●
If the resistance is incorrect, replace the
starter motor.
*****************************************************
Armature coil resistance:
Continuity check
1
:
0.025 ~ 0.035
Ω
at 20 °C (68 °F)
Insulation check
2
:
More than 1 M
Ω
at 20 °C (68 °F)