I got to know a couple who lived next to people i knew in the '70's, they had Nortons, but their mate had one of these, he left town, and the bike and the couple found another, and we used to go for Sunday jaunts.
One thing we used to do was head out past the airport and do second gear 'roll-ons', me old Road Rocket (RRT2), left em dead every time......!!!! Geez it sounded good at 70+mph in second.!!