What is the reason why the motorcycle idling is unstable, sometimes high and sometimes low?

The causes and solutions of motorcycle idling instability are as follows:

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Solution: Therefore, if the throttle is blocked by carbon deposits, it must be cleaned. After cleaning, you can observe whether the motorcycle is idling smoothly.

2. The fuel pressure is too low, and the intake branch pipe leaks oil: This situation is due to the blockage of the fuel injector or oil circuit, or the insufficient pressure of the fuel pump, which leads to the failure of the fuel pressure regulator.

Then it will cause poor atomization and unbalanced mixing ratio. So that phenomena such as incomplete combustion or excessive combustion may occur. It will lead to unstable idle speed of the engine, and in severe cases, the motor will not move or get stuck.

Solution: Clean up the blockage in the nozzle and oil circuit.

3. Sensor failure: that is, the sensor that collects relevant data fails and the data cannot be obtained normally. Therefore, a controlled combustion ratio cannot be accurately obtained. Therefore, if the sensor fails, the injector will not be able to control the injected fuel ratio well. Will lead to motorcycle idling instability, up and down.

Solution: Replace the sensor.

4. The connecting bolt between carburetor and engine intake pipe is loose.

Solution: Tighten the connecting bolts of the air inlet pipe.

5. The connecting gasket or guard plate between carburetor and engine intake pipe is damaged.

Solution: Replace the connecting gasket or guard plate of the intake pipe.