When I owned a FZ1, people on the internet reported their top speed around 150, via GPS. I never attempted a top speed run when I owned mine, but 120 came up pretty quick. The FZ1 is more aerodynamic and has about 30 more HP.
I've heard of a certain Tiger trying to keep up with a FZ1 and FJR on US 50, between Black Canyon and Gunnison, CO saw about 118 on the GPS before realizing they'd never catch the Yamahas. There was a little more available, but not much.