Yamaha Tracer MT09TRAH 2017 User Manual

ELECTRIC STARTER
5-36
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.
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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
0.0050–0.0150 
Insulation resistance
Above 1 M at 20 C (68 F)
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
6.03–6.52 N (615–665 gf, 21.71–
23.47 oz)

Yamaha Tracer MT09TRAH 2017 Specifications

General

Brand	Yamaha
Model	Tracer MT09TRAH 2017
Category	Motorcycle
Language	English