Generic Race 50, Service Manual, Page: 36 / 209

35
Ride-on
motorcycle
Sit-on
motorcycle
Y N
Y N
Trouble diagnosis program for rotation failure of starting motor
Electric horn does not
sound or only makes low
sound and turn signal lamp
light is dim
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
Grasp brake grip (sit-on motorcycle) or set
transmission to neutral position or grasp clutch
grip, and then depress start button.
Starting motor does
not rotate
Turn on ignition switch, depress horn button, or
toggle turn signal lamp switch.
After start button is depressed, engaging sound
of start relay it not heard.
After start button is depressed, engaging sound
of start relay can be heard.
Remove connector of start relay from complete
vehicle cable and then connect positive and
negative of battery with two lead wires of start
relay coil using two conductors.
Short battery terminal on start
relay and starting motor terminal
with a screwdriver or thick
conductor
After connection,
starting motor rotates
normally
After shorted,
starting motor can
rotate normally.
After connection,
starting motor does not
rotate yet and no
engaging sound of
start relay is heard
After shorted,
starting motor
does not rotate
yet.
Start relay coil
opened or
shorted
Check internal wiring of
electric start control system
Start relay contact
burned through or
damaged
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 armature
commutator for excessive
wear
4. Check armature coil for
open circuit or short circuit
1. Check start button
contact for poor
contact
2. Check rectifier
diode for damage
3. Check neutral
switch for improper
operation
4. Check internal
wiring of electric start
control system for
open circuit or short
circuit
Check start button
contact for poor
contact
Grasp brake grip to check if brake lamp
will come on
Internal contact of brake
lamp switch contacts poorly
or its supporting circuit is
opened
Repair or
replace start
button
Internal wiring of electric
start control system
opened or shorted