31
Riding-style motorcycle
Motorcycle scooter
Y
N
Diagnosis on starter motor failure in rotation
The electric horn does not make
sound or makes weak sound; the
steering lamp emits weak light.
Battery power shortage or bad
contact of conductor joint
Starter motor failure in
rotation
Turn the ignition switch; press the horn or turn the
steering lamp switch.
Press the startup button and there is no joint sound
from starter relay.
Press the startup button and there is joint sound
from starter relay.
Disassemble the connector of starter relay from the
cable assembly; use two lead wires to connect the
battery with two down-leads of the starter relay
coil.
Use screwdriver or large-diameter
lead wire to short-circuit the battery
terminal on the starter relay and the
starter motor terminal.
The electric horn makes loud sound
and the steering lamp emits bright
light.
The starter relay works
normally after connection.
Grip the brake lever (motor scooter), or make the
transmission at neutral gear, or grip the clutch
lever; press the startup button.
The starter motor
works normally after
short circuit.
The starter motor does not
work after connection,
and there is no sound
from starter relay.
The starter motor
does not work
after short circuit.
Open circuit or
short circuit of
starter relay coil.
Check the inner circuit of the
electric starting control system
Contacts of starter
relay are burnt or
damaged.
Disassemble the starter motor and
check:
1.
whether the carbon brush is
excessively abraded;
2.
whether the carbon brush
spring is ruptured or lacks
elasticity;
3.
whether the armature
commutator is excessively
abraded;
4.
whether open circuit or short
circuit occurs to the armature
coil.
1.
Check whether the
contact of starting
button is in good
condition.
2.
Check whether the
commutation diode is
damaged.
3.
Check whether the
neutral gear switch
works normally.
4.
Check whether open
circuit or short circuit
occurs to the inner
circuit of electric
starting control system.
Check whether the contact
of starting button is bad.
Grip the brake lever and check whether the
brake lamp is light.
Bad contact inside the brake
lamp switch or open circuit of
its auxiliary circuit.
