Checking The Starter Motor - Yamaha YP250R 2005 Service Manual

ELECTRIC STARTING SYSTEM
EAS00770

CHECKING THE STARTER MOTOR

1. Check:
• commutator
2. Measure:
• commutator diameter a
3. Measure:
• mica undercut a
NOTE:
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
4. Measure:
• armature assembly resistances (commuta-
M
a. Measure the armature assembly resis-
b. If any resistance is out of specification,
L
8 - 19
Dirt → Clean with 600 grit sandpaper.
Out of specification → Replace the starter
motor.
Commutator wear limit
27 mm (1.06 in)
Out of specification → Scrape the mica to
the proper measurement with a hacksaw
blade that has been grounded to fit the
commutator.
Mica undercut
0.7 mm (0.028 in)
tor and insulation)
Out of specification → Replace the starter
motor.
MMM M MMM M M MMM M M MMM
tances with the pocket tester.
Pocket tester
90890-03112
Armature coil
Commutator resistance 1
0.0012 ~ 0.0022 Ω at 20 °C
(68 °F)
Insulation resistance 2
Above 1 MΩ at 20 °C (68 °F)
replace the starter motor.
LLL L LLL L L LLL L L LLL
–
ELEC
M M MMM M M MMM M
L L LLL L L LLL L
+
MMM
LLL