Yamaha Scorpio Service Manual page 229

ELECTRIC STARTING SYSTEM
3.Measure:
Mica undercut b
G
Out of specification → Scrape the mica to
proper value use a hacksaw blade can be
ground to fit.
NOTE:
the mica insulation of the commutator must be
undercut to ensure proper operation of com-
mutator.
4.Inspect:
Armature coil (continuity/insulation)
G
Defects (s) → Replace starter motor.
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Inspecting steps:
G
Connect the pocket tester for continuity
check 1 and insulation check 2.
G
Measure the armature coil resistances.
G
If the resistance is incorrect, replace the
starter motor.
*****************************************************
5.Measure:
Brush length a
G
Out of specification → Replace.
7 - 21
ELEC
Mica undercut:
1.5 mm
Pocket tester:
90890-03112
Armature coil resistance:
Continuity check 1: (Ω × 1)
0 Ω at 20°C
Insulation check 2: (Ω × 1k)
More than 1 MΩ at 20°C
Brush length limit:
3.5 mm
– +