When the motorcycle travels tens of thousands of kilometers, or is used for a long time in heavy load or in a harsh environment, the riders will gradually feel that the engine's power is significantly reduced, and the fuel consumption is increasing. This situation may usually be caused by the engine piston ring. After the wear, air leakage occurs, so that the cylinder is under pressure, and the sealing performance of the cylinder is deteriorated, resulting in a decrease in the power of the motorcycle. 
To solve this problem is to dismantle the cylinder part, at least also belongs to the medium repair range, which is considered a big fault. As a rider, is there any easy way to test it? Yes, and only one finger is needed, no tools are needed.
The specific method is to first remove the spark plug, then use your fingers to block the spark plug, and press the start lever or press the electric start button. At this time, the finger should feel a strong air pressure impact, and there is airflow from the finger edge. Rush out.
If the pressure is small or the finger easily blocks the spark plug, it means that the compression force of the cylinder is obviously insufficient. There is definitely a leak. The cause of the fault is generally that the valve is not tightly closed, or the piston ring of the cylinder is too worn. Caused. The solution is to disassemble the engine and replace the piston ring and cylinder seal gasket.
In addition, when the crankcase of the engine or the joint portion of the cylinder generates air leakage, the cylinder pressure is lowered and the power is insufficient, and the engine exhaust pipe also emits blue smoke, which causes the fuel consumption to be greatly increased. At the same time, if the engine overheats, excessive carbon deposit in the muffler, slippery clutch friction plate, insufficient tire pressure, etc., the engine acceleration performance will be worse, and the power is obviously insufficient.
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