Checking The Brushes; Checking The Starter Motor Operation; Charging System; Checking The Rectifier (Wh, W) - Yamaha E40G Service Manual

4. Check the armature for continuity.
Replace if out of specifications.
c
Armature continuity
Commutator segments c
Segment – Armature core d No continuity
Segment – Armature shaft e No continuity

Checking the brushes

1. Measure the brush length a. Replace
the brush assembly if below specifica-
tion.
a
Brush length limit a:
9.0 mm (0.35 in)
6F65G11
d e
6F680190
Continuity
6F680200
Starter motor/Charging system
2. Check the brush holder assembly for
continuity. Replace if out of specifica-
tions.
2
Brush continuity:
Brush holder 1 —
Brush base 2

Checking the starter motor operation

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

Charging system

Checking the rectifier (WH, W)

1. Measure the rectifier output peak volt-
age. If below specification, measure the
lighting coil output peak voltage. Replace
the rectifier if the output peak voltage of
the lighting coil is above specification.
NOTE:
After starting the engine, disconnect the out-
put lead (red lead) 1 of the rectifier when
measuring the output peak voltage.
1
1
2
6F680210
3
No continuity
4
5
6
7
R
B
8
R R
1
6F680220
9
8-16