The motorcycle that hooked me on British Iron was a 1963 Triumph Tiger Cub. I had ridden Honda 90's up to that point, so the first ride on the 200cc Tiger Cub was a big jump.
That Tiger Cub was given to me 15 years later; I rebuilt it, and it became my son's first motorcycle ride. I still have the Cub, and it still runs. A photo is coming soon.