1. The new car must go through well:
Although the surface of the cylinder body is very bright from the manufacturer, it is still uneven on the microscopic level, and the convex part is easy to be injured. If it is subjected to a large load at this time, it will cause a strain on the surface of the cylinder body. Therefore, in the use of the new car, it must be lightly loaded. After the convex part is smoothed, the surface of the cylinder can bear a large load. In this way, the service life of the cylinder surface will be prolonged, and the relative life of the well-run cylinder is much longer than that of the unrun-in cylinder, which is proved by many scientists in practice. When the motorcycle leaves the factory, the manufacturers all require users to run-in the new car. The running-in period is generally between 1000 and 2000 kilometers. During the running-in period of the new car, some manufacturers add a speed-limiting tube to the motorcycle throat of the motorcycle, so that the speed of the new car is lower than that of the normal use. It is best not to carry people or objects. For two-stroke motorcycles, the mixing ratio of gasoline and lubricating oil should be increased to about 20:1 in order to be more conducive to the running-in of the cylinder surface.
2. The air entering the cylinder should be cleaned:
The air that enters the cylinder from the air cleaner, if it contains a lot of dust, will quickly increase the wear on the surface of the cylinder like abrasives, so make sure that the air that enters the cylinder is very clean. At present, most domestic motorcycles use paper core air filters. On the one hand, they must regularly (about 1000 kilometers) remove dust from the air filter. On the other hand, they must frequently check the sealing of the air filter joints to avoid Clean air enters the cylinder without passing through the filter. In order to improve the filtering effect, a layer of foam sponge can be added outside the paper core. Foam sponges must be cleaned with water once a day to avoid clogging.
3. The cylinder surface should have good lubrication:
Liquid friction is much less abrasive than dry friction. In order to avoid dry friction, the cylinder of the lubricating oil and the surface of the piston should be well adhered to form liquid friction. This requires that the lubricant has an appropriate viscosity. The viscosity of lubricating oil is related to temperature, and lubricating oils with different viscosity should be used in different seasons. International standards stipulate that the lubricant to be used in summer is API grade SD grade SAE10W/30. my country’s national standards stipulate that No. 6 gasoline engine lubricants are used in winter, No. 10 in spring and autumn, and No. 15 in summer. In addition, the oil pressure and oil gauge should be checked frequently to avoid using the motorcycle in the absence of lubricant.
4. The engine work must have good flexibility:
The cause of engine knocking is mainly caused by excessively fast combustion speed. The waterfall shock caused the piston to generate excessive impact force and knock on the cylinder wall to cause wear. The reason why the burning speed is too fast is that the gasoline grade used does not match the compression ratio of the engine. Motorcycle manufacturers stipulate that engines with a high compression ratio should use No. 80 gasoline, and those with a low compression ratio should use No. 70 gasoline. If the No. 70 gasoline is used with a high compression ratio, knocking will occur, causing wear on the cylinder surface. The speed of the engine is generally between the maximum torque and the maximum power. For domestic motorcycles, it ranges from 3000 rpm to 5000 rpm, so that each gear has a corresponding speed range. If the driver does not pay attention to timely gear shift and produces a stall, if the fuel is suddenly added at this time, the cylinder will produce a knocking sound. In this case, it should be shifted to low gear and re-accelerated in time, otherwise the surface of the cylinder body will be damaged due to knocking.
5. Avoid sticking cylinders:
The phenomenon of sticking cylinder is the blocky adhesion between the piston and cylinder surface. The main reason for sticky cylinders is the lack of lubricating oil in the engine. It is because the engine is not well cooled and overheated, which makes the lubricating oil lose its lubricating effect. How to avoid engine overheating? On the one hand, it is necessary to clean the heat sink of the cylinder frequently to make it have good heat dissipation conditions; on the other hand, it is necessary to observe the temperature of the heat sink frequently. The surface temperature after heat dissipation is generally below 180℃, which can be measured with a surface thermometer. Owners can also test the temperature of the heat sink by spitting. If the saliva makes a noisy noise on the heat sink, it means that the temperature is already very high, and it is necessary to stop and cool down in time, and then continue driving after the temperature drops to avoid the phenomenon of sticking to the cylinder.
In addition, when the speed of the vehicle is reduced after refueling, it should be stopped in time. This is a precursor to the sticky cylinder and can never be continued. After the engine cools, the piston should be removed and the surface of the cylinder and the piston adhered should be polished with sandpaper and whetstone. Only in this way can the damage already caused be saved, otherwise the cylinder will be scrapped.
6. Avoid using cold cars:
When using the car in winter, the lubricating oil is in a solidified state and cannot play the role of lubrication. At this time, preheating must be performed. The method of warming up is to let the engine run for more time in the idling state. After the temperature rises, the lubricating oil has worked and the vehicle is started.
7. Avoid depositing carbon into the cylinder: there is a lot of carbon deposit in the piston crown and cylinder head. When the carbon deposit falls into the cylinder, it will cause scratches and wear on the surface of the cylinder. In order to reduce the generation of carbon deposits, special engine oil must be used. Owners should also clean up the carbon deposits on the top of the piston in the cylinder head in time. When there is too much carbon deposits, it will make the combustion chamber smaller, increase the compression ratio, and cause knocking. Friends who own motorcycles, if you can do the above, the service life of your motorcycle will be extended.