Chinese Motorcycle and ATV Engine Numbers

Chinese Motorcycle and ATV Engine Numbers

Identifying Chinese motorcycle and ATV engines can be confusing. This article will help you learn to "decode" engine codes and understand which engine you have. To accurately determine the engine model and select parts that fit, you must know the engine type code. Usually, numbers are engraved on the left side of the engine, at the bottom, near the front mounting point to the frame. Most often, you will find two numbers. The lower code is the engine registration number, which is unique to each engine. The upper number is the engine type identification code – this is the one to pay attention to, as it indicates the type of engine you have.

Let's decode a popular engine type: 154FMI. This is a 125cc four-stroke engine. The engine type number reveals a lot of information. The first digit represents the number of cylinders. The absence of a letter between the first and second digits indicates a vertical engine. The next two digits, "54," specify the cylinder diameter in millimeters – 54 mm. The letter "F" denotes an air-cooled engine. The letter "M" indicates a motorcycle engine, while the last letter reveals the engine's displacement: "B" stands for 50 cc, "C" for 60 cc, "D" for 70 cc, "F" for 90 cc, "G" for 100 cc, "H" for 110 cc, "I" for 125 cc, "J" for 150 cc, and so on.

Moreover, many engines have a prefix that indicates the manufacturer, such as "QJ" for "Quinjiang" as the first two letters. There are also suffix numbers indicating engine iterations, for example, "-3" means it’s the third version of the design or an improvement. Below is a table with Chinese engine type codes, featuring the JOG two-stroke engine 1PE40QMB-3.

Examining the table, we can see that this is a single-cylinder, horizontal, two-stroke engine with a 40 mm cylinder diameter, air/fan-cooled, intended for motorcycles, with a 50 cc displacement, and is the third version.

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