Checking The Brushes; Checking The Magnet Switch; Checking The Starter Motor Operation; Charging System - Yamaha F80B Service Manual

Armature continuity
Commutator segments b
Segment –
Armature core c
Segment –
Armature shaft d

Checking the brushes

1. Measure the brush length. Replace the
brush assembly if below specification.
Brush length wear limit a:
9.5 mm (0.37 in)
2. Check the brush holder assembly for
continuity. Replace if out of specification.
1
2
Brush continuity
Brush 1 – Brush 2

Checking the magnet switch

1. Connect the tester leads between the
magnet switch terminals as shown.
2. Connect the positive battery lead to the
brown/white (Br/W) lead.
6D93G11
Continuity
No continuity
No continuity
S69J8440
No continuity
Starter motor / Charging system
3. Connect the negative battery lead to the
starter motor body.
CAUTION:
Do not connect the battery for more than
one second, otherwise the magnet switch
can be damaged.
4. Check that there is continuity between
the magnet switch terminals. Replace if
there is no continuity.
5. Check that there is no continuity after the
negative battery terminal is removed.
Replace if there is continuity.
NOTE:
The starter motor pinion should be pushed
out while the magnet switch is on.

Checking the starter motor operation

1. Check the operation of the starter motor
after installing it onto the power unit.

Charging system

Checking the stator coil

1. Disconnect the stator coil coupler.
2. Connect the test harness (6 pins) to the
stator coil coupler.
Br/W
S6D98010
8
8-16
1
2
3
4
5
6
7
8
9