How do you tell what year is your Yamaha ttr 90?

To determine the year of your Yamaha TTR 90, locate the Vehicle Identification Number (VIN) on the frame, typically found near the steering head or on the left side of the engine. The 10th character of the VIN indicates the model year; for example, "A" corresponds to 1980, "B" to 1981, and so on, with letters cycling every 30 years. You can also check the engine number, which may include a year code, or consult the owner's manual or Yamaha's official resources for further identification.