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10. Oxygen Sensor
●The oxygen sensor must be removed after the engine and muffler have cooled down
completely.
When there is poor engine performance, unstable idle speed, high fuel consumption, and
incorrect air-fuel ratio, check the oxygen sensor. The fault code can be read through the
diagnostic Speedometer to confirm whether the oxygen sensor is faulty.
10.1 Check
First follow the steps of disassembling the glove box to remove the glove box and find the four-pin plug of the
oxygen sensor. Pinch the top of the plug with two fingers, press the arrow indicating buckle, and then pull it out.
Use a multimeter to measure the resistance of the heating element of the two white wires to 9±2kΩ; or measure the
current should be less than or equal to 2.1A. Otherwise, it can be judged that the oxygen sensor is faulty. The ceramic
inside the oxygen sensor is hard and brittle. It is forbidden to knock with hard objects or blow with strong gas,
otherwise it is easy to cause damage.
Or remove the oxygen sensor and observe the color of the top
part of the head, which is normally light gray. If it is white, it
means that the silicon poisoning has been damaged and needs
to be replaced, if it is black, it means that there is carbon
deposits that can be cleaned up and continue to use; if it is
brown, it means that the silicon poisoning needs to be replaced.
10.2 Replace
First pull out the plug, use needle-nose pliers to remove the
buckle (1) from the bracket, and then use a 22# open-end wrench to remove it counterclockwise. Install after cleaning
the installation surface.
The thread of the new sensor is coated with a special paste-like thread anti-sintering agent to prevent air leakage
and facilitate subsequent disassembly. If there is no problem
after removing the old inspection, you need to apply a proper
amount of anti-sintering agent to the thread before installation..
Torque standards：44N.m (4.5 kgf.m, 32 lbf.ft).
Oxygen sensor thread: M18×1.5.
11. ECU
When the engine cannot be started and the performance is
poor, check whether the ECU is normal. Because the ECU is
more complicated and difficult to judge, the elimination method
can generally be used to remove the ECU from a normal vehicle
of the same model and replace it with a faulty vehicle.
Refer to the steps of "Maintenance-Rear Shock Absorption-
Replacement Rear Shock Absorber" and remove the right tail
skirt to expose the ECU.
The index finger and middle finger are respectively located
under the lever. While pressing the buckle with the thumb, turn
the index finger and middle finger to the thumb direction to pull out the ECU plug. Use 5# inner hexagon to remove the
bolt ⑴ to take off the ECU ⑵.
12. Crankshaft position sensor
When the engine starts without dust or is difficult to start; poor acceleration and unstable idling; when the engine is
stalled intermittently, it is necessary to check whether the crankshaft position sensor is normal.
The crankshaft position sensor is installed on the right crankcase cover and integrated with the magneto stator.
Locate the sensor plug on the right side of the vehicle, press the head anti-trip lock and pull it out. Use a multimeter to
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