Yamaha BEARTRACKER YFM250XC, Service Manual

Page: 289 / 398

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ELEC
ELECTRIC STARTING SYSTEM
STARTER MOTOR INSPECTION
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 measure-
ment 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 (0.028 in)
4.Inspect:
●
Armature coil (insulation/continuity)
Defects
→
Replace the starter motor.
*********************************
Armature coil inspection steps:
●
Connect the pocket tester for the continu-
ity 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 :
0.004 ~ 0.005
Ω
at 20 ˚C (68 ˚F)
Insulation check 2 :
More than 1 M
Ω
at 20 ˚C (68 ˚F)
8