Yamaha uses the letters and numbers that make up your model code to denote specifications of the motor. The date ID tag is located on the opposite side of the engine. You will need your serial number and manufacturing date. Since Yamaha no longer model-years motors, there is no longer a letter in the model coding that indicates year. Like this F300UCA with serial number 6CE-U-1023787. Models manufactured in mid-2005 and later use a different model coding system. The below model is a 2003 Z150TXRB with a serial number of 6G4-X-1005452.

There is also likely a manufacturing date tag on the starboard side of the engine just opposite of the ID tag. The model code and serial number are located on the port side of the motor, on or near the bracket. (While you are at it, write down the three digit number on your engine key. Consider taking a picture of the identification tag on your motor to keep in your phone, or write it down somewhere, in case the identification sticker gets worn. Take note of your motor model code and serial number (Primary ID). SIM Yamaha makes ordering parts quick and easy by providing two simple ways to find the parts you need: via motor model specific pages set up with just the common maintenance items, and via parts diagrams.

Yamaha engine serial numbers