I have edited my post the bikes in the video are the non street legal HR2 kawaskis, even back then Cappy the Vincent was capable of well over a ton, I think they were 120mph+ and really the only thing they had for brakes was how hard you could dig your heels in to get them to slow down.lol
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My Dad had one with a side car and he would pack us all up in it and away we would go for a day out at the beach, happy days.
Lawrence of Arabia was killed on one.
https://www.telegraph.co.uk/motoring...last-ride.html