Yamaha F90D, Service Manual

Page: 212 / 241

ELEC
Electrical systems
– +
8-15
6D81G11
Disassembling the starter motor
1. Slide the pinion stopper
1
down as
shown, and then remove the clip
2
.
NOTE:
Remove the clip with a thin screwdriver.
2. Remove the bolts, and then disassemble
the starter motor.
Checking the starter motor pinion
1. Check the teeth of the pinion for cracks
or wear. Replace if necessary.
2. Check for smooth operation. Replace if
necessary.
NOTE:
Turn the pinion counterclockwise to check
that it operates smoothly and turn it clockwise
to check that it locks in place.
Checking the armature
1. Check the commutator for dirt. Clean
with 600–grit sandpaper and com-
pressed air if necessary.
2. Measure the commutator diameter.
Replace the armature if below specifica-
tion.
3. Measure the commutator undercut
a
.
Replace the armature if below specifica-
tion.
4. Check the armature for continuity.
Replace if out of specifications.
Commutator diameter wear limit:
28.0 mm (1.10 in)
Commutator undercut wear limit
a
:
0.2 mm (0.01 in)