Single cylinder means this engine only have one cylinder. It is the most simple type during all engines. It has simple structure, low manufacturing cost and maintenance is not complicated. The power ranging from 1.7KW to 24KW, engines can be widely used for handheld and small four-wheel tractor, engineering machinery, three-wheel vehicle, generator set, Water Pump, air compressors, gardening machines , the processing of agricultural and side-line products and the like.