Yamaha F150B, Service Manual

Page: 167 / 458

5-42
Starter motor
0
1
2
3
4
5
6
7
8
9
10
A
Removing the starter motor
1. Remove the junction box cover.
2. Remove the starter motor from the power
unit.
Checking the starter motor operation
1. Hold the starter motor in a vise using alu-
minum plates on both sides.
2. Connect the positive battery cable
a
to
the magnet switch terminal
a
, and con-
nect the negative battery cable
b
to the
starter motor body.
3. Connect the starter motor lead (Brown/
White)
b
to the positive battery terminal,
and then check the starter motor opera-
tion.
WARNING! Do not touch the
starter motor pinion.
TIP:
• Check the starter motor operation for a few
seconds.
• If the starter motor is disassembled for
maintenance, make sure to check the oper-
ation again after assembling it.
4. Disconnect the negative battery cable
and positive battery cable from the bat-
tery terminals.
Checking the magnet switch
1. Connect the tester probes to the magnet
switch terminals
a
and
b
.
2. Connect the negative battery cable to the
starter motor body
c
.
3. Connect the positive battery cable to the
starter motor lead (Brown/White)
d
, and
then check the magnet switch continuity.
NOTICE: Do not connect the starter
motor lead (Brown/White) to the bat-
tery for more than 1 second.
4. Check that there is continuity between
the magnet switch terminals
a
and
b
.
Replace the magnet switch if out of spec-
ification.
TIP:
The starter motor pinion should be pushed
out while the magnet switch is “ON.”
Checking the starter motor pinion
Make sure to disconnect the battery
cables before checking the starter motor
pinion.
1. Check the pinion teeth. Replace the pin-
ion if cracked or worn.
Br/W
B
Br/W
b
a
a
b
Battery lead
Magnet switch
terminal
a b
Connect
Disconnect
Br/W
B
Br/W
a
b
c
d
a
b
d
c