Considering its yellow. I would be willing to bet its a 1981-83. However ,On the neck of the bike, should be a (4X4)-XXXXXXfollowed by six digits. Now depending if the first two numbers AFTER 4x4 will determine what year yours is. 00xxxx is the 1981 yzinger. 20xxxx is 1982 and 26xxxx will be 1983. I hope you find this information well and do NOT ever sell it. The value on these bikes are extremely appreciating!