TAYO Zontes ZT125-M 2022, Maintenance Manual

Page: 113 / 188

113 / 188
Unsteady idling, easy to cutoff
The engine is running at an unstable idling speed, easy to stall, and can return to normal after a warm car. You can refer to the
following diagnosis process to troubleshoot the cause of the fault.
Unsteady idling / flameout
Is gasoline enough
Check the oil circuit
Check whether the gasoline bottom
layer is obviously stratified (water
deposits)
Y
Whether it returns to
normal after filling gasoline
N
Can the fuel cutoff speed be
reached within 3 seconds when
the neutral throttle is fully opened?
N
normal Y
N Change the gasoline Y
Check whether the oil pressure of
the high-pressure oil pipe reaches
290kpa-310kpa (if there is no oil
pressure gauge, remove the
injector to observe the gasoline
atomization)
N
Check whether the battery
voltage is lower than 13V in
the shutdown state
Y
Y
Check whether the
oil pump buckle is off
N
Replace the oil pump
Check the battery, rectifier
and magneto
Y
Are there any modification
parts with strong magnetic
fields such as modified GPS
and anti-theft device?
N
Is it normal after
removal
Y
The modified parts with strong
magnetic field should be
installed as far away as possible
from the relay wiring harness
and electrical device box, or not
installed
Y
Check whether the black and
white wire and red wire of the
ECM main relay are back to
normal after short-circuiting
N
N
The flameout switch is faulty,
replace the right handle switch
Y
Turn off the flameout switch, and
check whether the engine
crankshaft position sensor and the
cable plug are tightly inserted or
water has entered
Tighten the plug /
Tighten the plug after
the drain is dried
Y
Check whether the crankshaft
position sensor wire is
damaged
N
Re-wrap the wiring harness with
electrical tape if repairable, replace
it if it is not repairable
Y
Does it return to normal after short-
circuiting the white-yellow line and the
black-brown line of the dump switch?
N
Replace the dump
switch
Y
Whether the ignition coil terminal (old)/
plug (plug) is loose or has poor contact
N
Clamp the terminal
and plug it back/plug
in
Y
Whether the high-voltage
line is crimped or broken
N
Troubleshoot or replace the
high-voltage line/ignition coil
Y
Whether the internal contact between
the ignition coil and the high-voltage
line is corroded or poorly contacted
N
Y
Whether the spark plug
is loose, carbon deposit,
aging
N
Troubleshoot or
replace the spark
plug
Y
Contact engineer N
N