Yamaha TMAX XP530-A 2017, Service Manual, Page: 311 / 676

ELECTRIC STARTER
5-32
EAS30325
CHECKING THE STARTER MOTOR
1. Check:
•
Commutator
Dirt

Clean with 600 grit sandpaper.
2. 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.
TIP
The mica of the commutator must be undercut to
ensure proper operation of the commutator.
3. Measure:
•
Armature assembly resistances (commutator
and insulation)
Out of specification

Replace the starter
motor.
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a. Measure the armature assembly resistances
with the digital circuit tester.
b. If any resistance is out of specification, re-
place the starter motor assembly.
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4. Measure:
• Brush length “a”
Out of specification

Replace the brush
holder set.
5. Measure:
•
Brush spring force
Out of specification

Replace the brush
holder set.
Mica undercut (depth)
0.70 mm (0.03 in)
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
Armature coil resistance
0.0105–0.0195 
Insulation resistance
No continuity (Above 1 M  )
1. Commutator resistance
2. Insulation resistance
Brush overall length
12.0 mm (0.47 in)
Limit
6.50 mm (0.26 in)
Brush spring force
6.02–6.51 N (614–664 gf, 21.69–
23.45 oz)