Step 1: Locate the engine number.
The engine number is usually stamped on the left side of the engine, just below the cylinder head. It will be a series of digits, usually starting with the letters "C" or "F."
Step 2: Decode the engine number.
The first two digits of the engine number indicate the year in which the engine was manufactured. The third digit indicates the month, and the fourth and fifth digits indicate the day of the month. For example, an engine number of "C0123456" would indicate that the engine was manufactured in January 2001.
Step 3: Compare the engine number to a Honda production list.
Honda has published a list of engine numbers and their corresponding years of manufacture. You can find this list on the Honda website or in various motorcycle reference books.
Step 4: Verify the age of the motorcycle.
Once you have determined the year in which the engine was manufactured, you can verify the age of the motorcycle by checking the Vehicle Identification Number (VIN). The VIN is a 17-digit code that is stamped on the motorcycle frame. The first two digits of the VIN indicate the year in which the motorcycle was manufactured. For example, a VIN of "1HFTE04F16B000123" would indicate that the motorcycle was manufactured in 2016.
By following these steps, you can easily find the age of a Honda CR 125 motorcycle by using the engine number.