Motorcycle model compilation instructions: The motorcycle model consists of five parts: trademark (or enterprise) code, specification code, model code, design serial number, and enterprise custom code. For example, the YH50Q-2D motorcycle model is established as follows. The specific instructions for establishing the motorcycle model are shown in the table below. Instructions for motorcycle model compilation: The trademark (or enterprise) code represents the trademark (or enterprise) name of the motorcycle, which is generally composed of the first letters of the Chinese pinyin of the trademark name. For example, XF125 is composed of the first letters of the Chinese Pinyin of the "Happiness" brand trademark. The code name refers to the specification (displacement) of the motorcycle, which is generally expressed by the working volume (nominal displacement) of the motorcycle engine cylinder. The unit is cm_ and is generally composed of Arabic numerals. For example, for motorcycles such as DY100, WY125A, and CJ750B, the numbers 100, 125, and 750 in their model numbers indicate that the cylinder working volumes of the engine used in the motorcycle are 100cm_, 125cm_, and 750cm_ respectively. Type represents the category of motorcycle. The letter "Q" for mopeds means that except for motorcycles it is a combination of a certain code and a model code. The model code and model code are represented by the uppercase Chinese pinyin letters of the motorcycle model name and model name respectively. Model preparation of new motorcycles: The model preparation of new products should be reported to the industry standardization centralized management department before product identification, and can only be used after being issued. The model of a new product generally consists of the following four parts. (1) The first part is the company name, such as Honda, BMW. (2) The second part is the model series code or car name expressed in letters, such as CBX, GS. (3) The third part is the working volume of the engine, generally in cm_, and in Germany it is generally in 10cm_. (4) The letters in the fourth part represent symbols for structural features such as body and engine. Unsymbol represents a basic type. The model composition of the new product is as follows: