Different masters have different practical experiences and will draw different conclusions, which in turn affects their adjustment methods. For example, many people think that the valve clearance is small and the cold car is big, which will cause him to adjust the gap will be big or small, and some people think that the gap hot car is big and the cold car is small, then Will sell him when he adjusts, the gap will be small and not big. Is the fact really so simple? Why do different masters come to different conclusions? In fact, because the material of the cylinder head and the valve of the motorcycle are different, that is, the specific heat capacity and thermal expansion coefficient of the two are different, the change of the valve clearance with time after the Engine is started is small and large, as shown in the figure. When the engine is started, since the specific heat capacity of the valve exposed to the combustion chamber is relatively low and the volume is relatively small, that is, the temperature rises relatively quickly, the thermal expansion is faster than the cylinder head, and the valve clearance becomes smaller. When the engine is cooling, if the valve clearance is smaller than the specified value, the valve will cause the valve rocker to squeeze the valve to be completely closed after starting, which may cause malfunctions such as poor compression and unstable idle speed. After the start-up, as the whole engine is heated, since the thermal expansion coefficient of the aluminum alloy cylinder head is larger than that of the steel valve, the valve clearance which is once smaller will gradually widen, and the valve clearance will be larger than when the engine is cooled. If the valve clearance exceeds the allowable value when the engine is cooled, an abnormal "click" sound will occur when the cylinder head is fully heated. Therefore, the valve clearance should be adjusted within a certain range (see the technical parameters of the instruction manual, this is best not to be adjusted by experience).
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The valve clearance is the gap between the valve and the rocker arm . Many experienced riders know that if the valve foot clearance is too large, the cylinder head position will have a clear "beep" sound, and the car's power will drop, so the experienced master will decide whether to adjust the valve foot according to the abnormal sound. gap.