Checking The Starter Motor - Yamaha TMAX 2020 Service Manual

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.
Mica undercut (depth)
0.70 mm (0.03 in)
TIP
The mica of the commutator must be undercut to
ensure proper operation of the commutator.
G088986
3. Check:
• Armature assembly
a. Connect the digital circuit tester and check
the continuity.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with ta-
chometer
YU-A1927
b. If there is no continuity, replace the starter
motor.
ELECTRIC STARTER
4. Measure
• Brush length "a"
Out of specification  Replace the brush
holder set.
Brush overall length limit
6.5 mm (0.26 in)
G088989
5. Measure:
• Brush spring force
Out of specification  Replace the brush
holder set.
Brush spring force
6.02–6.51 N (614–664 gf, 21.69–
23.45 oz)
6. Check:
• Gear teeth
Damage/wear  Replace the starter motor
assembly.
7. Check:
• Bearing
Damage/pitting  Replace the starter motor
assembly.
5-37