Locate the VIN number and you'll know for sure what year it is. VIN should be located on a horizontal bar behind the front brush guard. If not there, keep looking on all the front parts of the frame. The VIN in 17 digits long.
The 10th digit of the VIN number is a letter and indicates the year it was made.
J - 1988
K - 1989
L - 1990
M - 1991
Also, you can go here to check the VIN number:
https://www.atvstyle.com/atv-vin-number
Hope this helps you.
