How to identify the year of a YZ 125?

Look at the frame for a sticker that will say the year OR find the VIN number stamped on the neck of the bike frame - it is 17 digits. One of the letters (not a number) in the VIN is the YEAR CODE. look up on net for a VIN DECODER and run the VIN. it will tell you the year OR bring VIN into a Yamaha dealer they will tell you