foreign horses are of good quality. Yangma is a Japanese brand, which has considerable strength and reputation in the water displacement engine market. Yangma single-cylinder diesel engine is not only excellent in power and performance, but also reliable in quality. Yangma engine adopts advanced technology and technology, and has high reliability and durability after strict quality control and testing. Moreover, as an international first-line brand, Yangma's accessories and after-sales service are more convenient and reliable. The quality of foreign horses is better. Advantages of foreign horse engine: fuel saving, strong stability and energy saving. Yangma engine is equipped with the "ECO" automatic throttle of the national third emission ECO environmental protection economic model electronically controlled diesel engine-according to the operating conditions, the electronically controlled governor supplies oil, the fuel injection is accurately controlled, the best combustion, environmental protection and energy saving are achieved. Disadvantages of Yangma engine: it is easy to burn oil at high temperature. Yanmar is a Japanese diesel engine manufacturer with a history of more than 1 years. The engines manufactured by the company are widely used in ocean-going ships, construction equipment, agricultural equipment and generators. Chang Chai Engine: "Chang Chai" brand trademark was first recognized as a well-known trademark in China among domestic production materials products. In 1983 and 1988, Chang Chai won the National Quality Management Award twice. In 1993, it took the lead in passing the ISO9 quality system certification in the same industry in China. In 25, it won the title of "China Famous Brand Product" for the first batch of single-cylinder diesel engines. In 27, it won the title of "National Inspection-free Product" for single-cylinder engines. In 29, it passed the ISO141 environmental management system certification, and in 21, it passed the automobile product quality management system. The advantages of diesel engine are large torque and good economic performance. The working process of diesel engine has many similarities with that of gasoline engine, and each working cycle also goes through four strokes: intake, compression, work and exhaust.