Checking The Starter Motor - Yamaha XF50W Service Manual

ELECTRIC STARTING SYSTEM
EAS00769

CHECKING THE STARTER MOTOR

1. Check:
2. Measure:
3.
NOTE:
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
4. Measure:
T T T T T T T T T T T T T T T T T T T T T T T
a. Measure the armature assembly resis-
a
8-21
• commutator
Dirt -» Clean with 600-grit sandpaper.
• commutator diameter a
Out of specification
motor.
Commutator wear limit
16.6 mm (0.65 in)
Measure:
• mica undercut a
Out of specification
to the proper measurement with a hack-
saw blade that has been grounded to fit
the commutator.
Mica undercut
1.35 mm (0.05 in)
• armature assembly resistances (commu-
tator and insulation)
Out of specification
motor.
tances with the pocket tester.
Pocket tester
90890-03112 (YU-03112-C)
Armature coil
Commutator resistance 1
0.0378 ~ 0.0462
Insulation resistance 2
Above 1 M at 20°C(68°F)
+ 1
ELEC
-» Replace the starter
-» Scrape the mica
-» Replace the starter
at 20°C (68°F)