Yamaha VMX12H Supplementary Service Manual page 314

ELECTRIC STARTING SYSTEM
7-1 1
Removal
1. Remove:
Inspection and Repair
1. Inspect:
2.
3. Measure:
NOTE:
The mica insulation of the commutator must be
undercut to ensure proper operation of the
4. Measure:
or
more
motor
3.
Refer to "CHAPTER
ASSEMBLY" section.
Commutator
Dirty Clean with
Measure:
Commutator diameter
Out of specification
motor.
undercut
(between commutator segments)
Out of specification
proper valve.
Use a hacksaw blade that is ground to fit.
Mica Undercut:
0.7 mm (0.028 in)
mu r.
coil
Replace starter motor.
Insulation Resistance:
1 Mi2 or more a t 20°C
Continuity check
Insulation check
Armature coil
ENGINE DIS-
grit sandpaper.
Replace starter
Scrape mica to