2. Consult a Yamaha dealer or service center. They can usually identify the model year of a Yamaha Big Bear 350 4x4 by its VIN number, even if the VIN is worn away.
3. Use an online VIN decoder. There are several online VIN decoders that can provide information about a vehicle's model year, including the Yamaha Big Bear 350 4x4. Some popular VIN decoders include:
- [Carfax Vehicle History Report](https://www.carfax.com/VehicleHistory/Search/Index?partner=YAM&source=YMH_vin)
- [VINCheck](https://www.vincheck.us/)
- [MyVIN](https://www.myvin.com/)
4. Check the frame or engine block for the model year. Some Yamaha Big Bear 350 4x4s have the model year stamped into the frame or engine block.