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Jul 11, 2018

The body is composed of three parts, the cylinder head, the cylinder body and the crankcase, the cylinder cover is cast by aluminum alloy, and the new type four-stroke motorcycle engine adopts top valve, chain drive and overhead camshaft structure mode. Cylinder body material to double metal (wear-resistant cast iron cylinder sleeve cast aluminum heat sink) for many, in order to get better cooling effect. Some motorcycles wear cast iron cylinder body, such as the Yangtze River 750, Jialing JH70 type, in some small mopeds, such as Jade River brand yh50q Small displacement (50 cubic centimeter) engine using aluminum alloy cylinder wall plating 0.15 mm hard chromium layer structure. The crankcase is a combination of the left and right two boxes by the aluminum alloy die-casting.

Some motorcycles have a buffer block between the heat dissipation signs to inhibit the noise emitted by the fins.

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