Failure diagnosis procedure when the start motor is unable to rotate
The electric horn does not sound
or the sound is weak, and the
light of turn signal is pale
The sound of the electric horn is
loud and the light of turn signal is
bright
The electricity in the storage
battery is insufficient or the wire
terminal connecting the storage
battery is in poor contact
Hold the brake handle (seat-type motorcycle)
tightly, or put the gear shift in neutral gear or hold
clutch handle tightly, press the start button
Start motor is unable to rotate
Turn on the ignition switch, press the horn button or toggle the turn signal switch
Press the start button, you can not hear the connection sound of
the start relay
Press the start button, you can hear the
connection sound of the start relay
Remove the insert connector of the start relay from the
complete vehicle cable, then use two wires to connect the
positive terminal and negative terminal of the storage battery
and the two leading wires of start relay coil
Use the screwdriver or heavy gage wire
to short-circuit the storage battery
terminal on the start relay with the start
motor terminal
The start relay can
rotate normally after
connecting
The start motor can
rotate normally after
shorting
The start motor can not
rotate after connecting, and
the connection sound of
start relay can not be heard
either
The start motor does
not rotate after
shorting
The start relay coil
is broken or
short-circuited
Check if the line of electric start
control system
The start relay
contact is burnt or
damaged
Disassemble the start motor and do
the following inspections:
1. Check if the carbon brush is
over-worn
2. Check if the carbon brush spring
breaks or the spring force is
insufficient
3. Check if the surface of armature
commutator is over-worn
4. Check if the armature coil is
broken or short-circuited
1. Check if the starting
button contact is in poor
contact
2. Check if the
commutating diode is
damaged
3. Check if the neutral gear
switch works well
4. Check if the line of
electric start control system
is broken or short-circuited
Check if the starting
button contact is in
poor contact
Hold the brake handle tightly and check if the brake lamp
will light up
The inside contact of brake
lamp switch is in poor
contact or its wires are
broken
Repair or replace
the starting button
Check if the line of electric
start control system is
broken or short-circuited
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