Slim pickings 1958 ajs model 31 AKA the hurricane or a 125 air cooled Ducati the Aj had 35 bhp at 6500RPM (cant really believe it revs that high) or I could choose the c15 but it would seize on the way home from the shop!
i quite like the look of the 31

and my late father in law swore by them (or was that at them) He was a DR in the signals in WW2 His was a 350 single AJS