Removing The Starter Motor; Checking The Starter Motor - Yamaha CS50 Service Manual

ELECTRIC STARTING SYSTEM
k a
k a

REMOVING THE STARTER MOTOR

1. Remove:
• exhaust pipe assembly
• rear wheel
• starter motor
EAS00769

CHECKING THE STARTER MOTOR

1. Check:
• commutator
Dirt Clean with 600-grit sandpaper.
2. Measure:
• commutator diameter k a
Out of specification
motor.
Commutator wear limit
14.8 mm
3. Measure:
• armature assembly resistances (commuta-
tor and insulation)
Out of specification
motor.
a. Measure the armature assembly resistances
with the pocket tester.
Pocket tester
90890-03112
Armature coil
Commutator resistance
0.064 ~ 0.079 Ω at 20°C
Insulation resistance
Above 1 MΩ at 20°C
b. If any resistance is out of specification,
replace the starter motor.
4. Measure:
• brush length k a
Out of specification
as a set.
Brush length wear limit
0.9 mm
8-17
ELEC
Replace the starter
Replace the starter
Replace the brushes