motorcycle body composition

The body consists of three parts: cylinder head, cylinder block and crankcase. The cylinder head is made of aluminum alloy and has heat sinks. The new four-stroke motorcycle engine adopts the structure of overhead valve, chain drive and overhead camshaft. The material of the cylinder block is mostly bimetal (aluminum heat sink cast outside the wear-resistant cast iron cylinder liner) to obtain better heat dissipation effect. Some motorcycles use wear-resistant cast iron cylinders, such as Changjiang 750 and Jialing JH70. In some small mopeds, such as Yuhe brand YH50Q small displacement (50 cubic centimeters) engines, the inner wall of the aluminum alloy cylinder is plated with 0.15 mm hard Structure of the chrome layer. The crankcase is made of aluminum alloy die-casting and is composed of left and right boxes. Some motorcycles have a buffer block between the heat dissipation fins to suppress the noise from the vibration of the heat sink.