Checking The Starter Motor - Yamaha YFM45FAR Service Manual

ELECTRIC STARTING SYSTEM

CHECKING THE STARTER MOTOR

1.Check:
Commutator
G
Dirty → Clean it with #600 grit sandpaper.
2.Measure:
Commutator diameter a
G
Out of specification → Replace the starter
motor.
3.Measure:
Mica undercut b
G
Out of specification → Scrape the mica using
a hacksaw blade.
NOTE:
Scrape the mica to the proper measurement
using a hacksaw blade which has been
grounded to fit the commutator.
4.Check:
Armature coil (insulation/continuity)
G
Defects → Replace the starter motor.
*****************************************************
Checking steps:
G
Connect the pocket tester for the continuity
check 1 and insulation check 2.
G
Measure the armature resistances.
G
If the resistance is incorrect, replace the
starter motor.
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9 - 20
ELEC
Outside diameter:
28 mm (1.10 in)
<Wear limit:>
27 mm (1.06 in)
Mica undercut:
0.7 mm (0.03 in)
Armature coil resistance:
Continuity check 1:
0.025 ~ 0.035 Ω at 20 °C (68 °F)
Insulation check 2:
More than 1 MΩ at 20 °C (68 °F)
– +