气缸体是发动机的核心部件，二冲程气缸体气缸壁上一般设有1个排气孔和3个扫气孔，排气孔的位置较高；2个主扫气孔位于排气孔左右两侧，一般有15°左右的仰角，并在气缸横截面上形成120°左右的交角。%Cylinder block is a key component of motorcycle engine. There are generally one exhaust port, two primary scavenging ports, and one secondary scavenging port on the cylinder block of two-stroke engine, with the exhaust port situated at a higher position. The primary scavenging ports are found on each side of the exhaust port. Each primary scavenging port has an elevation of 15 degrees and forms a 120-degree angle with the cross section of cylinder.
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