2. Decode the VIN. The 10th character of the VIN is the year model code. The following chart shows the year model codes for Yamaha Timberwolfs:
* A = 1987
* B = 1988
* C = 1989
* D = 1990
* E = 1991
* F = 1992
* G = 1993
* H = 1994
* J = 1996
* K = 1997
* L = 1998
* M = 1999
* N = 2000
* P = 2002
* R = 2004
3. Check the engine displacement. The Timberwolf was produced in two different engine displacements: 250cc and 400cc. The engine displacement is stamped on the engine case.
4. Check the model number. The Timberwolf was produced in several different models, including the XT, EPS, and S. The model number is located on the side of the ATV.
