Zontes ZT125-M 2022, Maintenance Manual

Page: 67 / 218

67 / 218
g. Use throttle valve body cleaning agent to clean the
carbon deposits on the intake manifold and throttle valve
body outlet respectively. It is forbidden to directly soak the
throttle valve body assembly and intake manifold assembly
with any liquid.
h. After cleaning the heat insulation pad, replace 2 new O-
rings ⑽ and assemble them in place. Wipe clean the contact
surface of the intake manifold and the heat insulation pad
and the end surface of the heat insulation pad and the
engine. Reversely reset all materials in the order of
disassembly.
4. M310 Disassemble the three-in-one sensor
a. If the idling speed is abnormal, it is easy to extinguish
and the spark plug and high voltage coil are eliminated, the
three-in-one sensor needs to be removed for investigation. It
should not be disassembled under normal circumstances.
b. Refer to the steps for removing carbon deposits
without disassembling the throttle valve body, and unplug
the plugs of the stepping motor① and the CTS three -in-one
sensor②. Remove the stepper motor. After turning off the
power, take out the stepping motor, do not loosen the cable
plug, press the flameout switch at startup without ignition,
check whether the motor plug can shrink back and forth, and
finally turn off the flameout switch to check whether the plug
returns to its original position.
To check whether the stepper motor is abnormal, measure
whether the resistance at both ends of A and B is 53±5.3Ω.
Bolts for fixing the stepper motor: GB9074.4 M4×12.
c. Use a short Phillips screwdriver to remove the 2
GB9074.4 M4×16 bolts③ that comes with the throttle valve
body assembly, and then remove the the anti- off card④,
and then take off the stepper motor. It is forbidden to soak
the sensor with any liquid.
d. Wipe clean the sensor head or replace with a new three-
in-one sensor, align the three-in- one sensor with the shaft⑤
and install it back on the valve body. Reinstall the stepper
motor.
5. Remove sensor from M350 throttle body
If the idle speed is abnormal, it is easy to stall, and the
spark plug and high voltage coil are excluded, the sensor
needs to be removed for troubleshooting. It should not be
disassembled under normal circumstances.
a. Repeat the previous steps to remove the seat cushion
and bolts on the rear before proceeding to the next step.
Remove the 4 expansion nails on both sides of the front.
b. Use the 4# hex socket to remove the M6x16 bolts on
both sides.
C.Unplug the stepper motor ① and throttle position
sensor ②.