In the motorcycle troubleshooting maintenance work, sometimes encountered engine can not accelerate the fault.

Engine can't accelerate the failure is due to the many adverse factors caused by a failure performance, although many engine cannot accelerate the failure phenomenon in the form of performance close to, but can directly cause the engine can't accelerate the failure reason is various, such as, fuel system, ignition system, engine fault can't work normally, can cause the engine can't to accelerate failure.

Because the engine can not accelerate the fault suspect distribution range is large, can not quickly pass inspection, inspection to find and determine the fault suspect, so the fault troubleshooting is more difficult, the difficulty of troubleshooting is also relatively large.

Sometimes, it takes a lot of energy and time for motorcycle maintenance personnel to troubleshoot an engine that cannot accelerate. It can also be said that the engine can not accelerate the fault, is a motorcycle maintenance personnel have a headache.

Engine failure can be roughly divided into two types.

The failure of engine acceleration is classified according to whether there is a reverse injection phenomenon at the carburetor inlet. Its manifestations are as follows:

A: In the event of an engine failure to accelerate, there is A noticeable reverse jet flow from the carburetor inlet.

Engine start and idle speed operation is normal, the engine work speed can also be successfully by the working condition of idle speed to low speed condition could even accelerate to medium speed conditions, continue to increase the carburetor throttle opening, engine speed inspection, engine working speed can not continue to improve, muffler emit of thick black smoke billowed, engine working speed significantly high and low volatility.

Even if the carburetor valve will be fully open, the engine operating speed cannot continue to improve, the engine will not have the phenomenon of flameout. If the air filter is disconnected from the carburetor and the engine acceleration test is carried out, it will be found that when the engine cannot accelerate, the carburetor inlet has obvious reverse jet flow, and the engine cannot accelerate failure has no obvious change.

B: In the event of engine failure, there is no apparent reverse jet flow from the carburetor inlet.

Engine start and idle speed operation is normal, the engine work speed cannot successfully by the working condition of idle speed up to the working condition of low speed or accelerated to medium speed conditions, continue to increase the carburetor throttle opening, engine speed inspection, engine working speed not only cannot continue to improve, it will appear to flame-out phenomenon, engine working speed had no obvious high and low volatility.

If the air filter is disconnected from the carburetor and the engine acceleration test is carried out, it will be found that when the engine cannot accelerate, there is no obvious reverse jet flow from the carburetor inlet, and there is no obvious change in the engine failure to accelerate.

There are other forms of engine failure, but these are the two main ones.

The first thing to do when you start a maintenance operation to remove engine failure is to pass inspection and inspection. Confirm whether the engine can not accelerate the fault is related to the fuel system. This kind of inspection and inspection is relatively simple and easy, which can accurately determine whether the fuel system is not working normally, causing the engine can not accelerate the fault.

Riding a motorcycle can adopt the method of appropriate closed carburetor choke, seated motorcycle can adopt the method of local blocking air filter inlet, increase the carburetor inlet resistance, reduce the amount of air into the engine cylinder, the carburetor mixing chamber form a larger pressure difference, the carburetor in under the action of pressure difference, part of the main nozzle provide more foamy gasoline, in order to increase the concentration of the combustible mixture, engine speed inspection at the same time.

If there is a significant change in the engine acceleration condition (improvement or deterioration of the engine acceleration condition), it can be determined that the engine failure to accelerate is related to the fuel system. It is the fuel system failure that causes the engine failure to accelerate.

Further inspection and inspection should be carried out on the fuel system to finally determine the suspected fault. Through maintenance or replacement of electrical components, the failure of engine non-acceleration can be successfully eliminated.

If there is no significant change in the engine acceleration condition (improvement or deterioration of the engine acceleration condition), it can be judged that the failure of engine acceleration has nothing to do with the fuel system, and the possibility of engine acceleration failure caused by the failure of the fuel system is excluded.

At this point, the engine can not accelerate the fault should be further inspection, inspection, and finally determine the fault suspect. Due to space limitations, we will cover the root causes of this situation and how to eliminate them in the next article