The main function of a motorcycle shock absorber is to mitigate and absorb the impact and vibration transmitted to the wheels due to uneven road surfaces, as well as to transmit force and torque. It also plays an important role in the smoothness and safety of motorcycle driving. When maintaining, the shock absorbers of the motorcycle should be kept clean. Regularly check whether the shock-absorbing springs are deformed and whether the shock absorbers are loose. For the shock absorbers of hydraulic motorcycles, it is also necessary to frequently check for any oil leakage, verify if the shock absorber oil is fully filled, and replace the shock absorber oil regularly. Generally, the shock absorber oil should be replaced once a year.

When replacing, first unscrew the oil drain plug to drain the old oil into the basin. To completely drain the old oil from the shock absorber, hold the brake handle tightly and repeatedly press the steering handle downward. After the old oil is completely drained, drain the shock absorber oil from the other side of the shock absorber. Then unscrew the compression nut at the top of the inner tube and add kerosene or gasoline through the oil filling hole to clean it thoroughly. Add the shock-absorbing oil of the specified grade and capacity as required.

When the rear wheel of the motorcycle is impacted and jumps upward, the lower joint and the piston rod, along with the piston, also move upward. Due to the open internal oil passage, the volume above the piston gradually decreases, and the oil is compressed, compressing the spring. As the channel in the airbag is filled with inert gas, the gas has a certain pressure. Under its action, the upward movement of the oil is restricted, and the spring absorbs part of the impact energy. Thus, the impact was mitigated.

Conversely, when the wheel returns to its original position, during the process of the spring resetting and lengthening, the oil passage inside the damping valve seat is closed. Due to the large flow resistance of the oil and the effect of the small spring in the cylinder, the return speed of the oil can be effectively reduced, thereby mitigating the impact.

The oil-gas type motorcycle shock absorber has excellent shock absorption performance and strong adaptability. Ordinary shock absorption is supported by springs and oil pressure damping. In addition to the above two types, nitrogen shock absorption also includes nitrogen damping. The advantage of nitrogen damping is that it reacts quickly under pressure and slowly under back pressure.