Thank you very much for your positive input!My best guess is that you have a 1991 SM1000. It is common for frames built in the Fall months to be intended for the next model year. Your bicycle has been modified quite a bit over the years. That front fork and wheel are not original, nor are the linear pull brakes. What I am basing my guess on is the brake cable stops welded on the top tube, which was new for 1991, and the color of the frame. Silver was a unique color in those years. The color was called Jetfighter Silver on the SM1000.