motorcycle model SY125-27, where SY is the abbreviation of manufacturer, such as Sanya, Sanyang, Saiyang and other brands (each letter of the word manufacturer's brand), 125 is the exhaust engine displacement of 125CC (that is, 125ml? , that is, 125 ml), this is the cylinder volume, not the power. The power of a 125CC motorcycle is generally around 6.5-8. kW according to different models. The -27 after 125 is the internal number of the manufacturer. The number 27 or other letters are only used to represent a specific model of the factory, which is arranged in sequence, and has nothing to do with the quality, performance and power of the car. It is only used to distinguish different models of the same factory with the same displacement, or multiple different modifications of the same model.