Generic Race 50 - Page 37

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Trouble diagnosis program for weak rotation of starting motor
Turn on ignition switch, depress horn button, or toggle
turn si
g
nal lam
p
switch.
Electric horn does not
sound or only makes low
sound and turn signal lamp
li
g
ht is di
m
Electric horn can make loud and
clear sound and turn signal lamp
can give off bright light
Battery level is low or
conductor joint connecting
battery contacts poorly
Check conductor joint between
start relay and starting motor for
poor contact
Remove connecting conductors of starting motor and
battery from start relay, depress start button, and
then use an ohm meter to measure if resistor between
battery terminal and starting motor terminal on start
relay is conductive when start relay makes engaging
sound.
Check and
troubleshoot
Disassemble starting motor and perform
the following checks:
1. Check carbon brush for excessive
wear
2. Check for the carbon brush spring
broken or having insufficient elastic
force
3. Check surface of armature
commutator for sticking dirt or burn
through and damage
4. Check armature commutator for
excessive wear
Start relay contact
burned through or
damaged
Starting motor
rotates weakl
y