Don't worry if the motorcycle engine fails. Determine what the fault is and what the fault is. There are mainly the following types: the engine can not start or start difficult; suddenly extinguished or can not be extinguished on the way; the motorcycle is running weak or the engine is overheated; the engine is running irregularly; the engine has abnormal knocking sound; the carburetor is tempered and exhausted The tube is fired.
The main reasons for these failures are: the fuel supply system is abnormal; the ignition system is malfunctioning; the engine moving parts are worn; the engine is leaking or leaking oil; the parts are damaged or improperly assembled; the gasoline engine is mainly the oil circuit and the circuit often malfunctions. , mechanical failure is less, only in the case of severe wear, improper assembly adjustment or accidents. Therefore, when diagnosing a fault, first check the ignition system.
Mainly check the working condition of spark plug, start relay and ignition coil, or switch disconnection, engine can not generate electricity, regulator, battery damage, etc. Check the fuel supply system again. Whether the fuel line of the fuel tank is unblocked is “poor oil” or “rich oil”. Then check the compression of the cylinder and the tightness of the crankshaft.
Although it is a relatively complicated work in the diagnosis of sound, but with both theoretical knowledge and practical experience, the diagnosis results are more accurate. Pay attention to the characteristics of the sound, although some sounds are large, but the impact on the engine is small, that is, "beneficial sound"; some sounds are small, but the impact on the engine is very large, that is, "malignant noise." When a vicious voice appears, it should be repaired immediately. If a benign sound appears, you can go home and repair it. Checking for difficult engine starting The engine is difficult to start, and the common causes are: The mixture is too lean.
When the cold start is too low, the mixture is too lean, which is one of the reasons for the difficulty in starting. In this case, the rich valve should be opened or the concentration of the carburetor mixture should be adjusted. Check whether the LK80T is working properly. There is a slight air leak, which usually occurs at the junction between the carburetor and the intake pipe head or the left and right crankcases. Apply some soapy water to the joint or joint seam and start it a few times. Spark plug carbon is seriously "drowned". Both of these conditions reduce the intensity of the spark and cause difficulty in starting.
Spark plugs are mainly caused by poor combustion or excessive oil, while being "flooded" is due to excessive mixture. The spark plug electrode gap is too large or too small, affecting the spark strength. Electronic igniter malfunction. It can be judged by comparing the electronic model of the peer model with good working condition. Poor contact or leakage may occur in the wiring of the rest of the ignition system. The magneto ignition coil does not work properly.
The ignition system is working properly, but the start-up is still difficult, so it is likely that there is a problem with the fuel supply system. In addition to checking whether the oil in the fuel tank is mixed with water or not, the oil supply system mainly checks the carburetor, and the carburetor often causes poor oil supply due to too much impurities in the float chamber and blockage of the main orifice. Excessive carbon deposits in the exhaust port and exhaust pipe, and the inside of the muffler are too dirty, which may cause difficulty in starting.
If the motorcycle engine is difficult to start, it can be inspected according to the above nine methods, and it can be eliminated one by one, and each one can be repaired to restore the good starting performance of the engine.