Hi all, I`ve aquired a francis barnett autocycle and i`m trying to
find out its age. The stamping on the left side below the saddle
states M and what looks like a B but if it has an M it must be an H.
(These two letters are not very clear.) This makes it a 1946/7
powerbike 50. I`ve never seen a picture of a powerbike 50 but only a
powerbike 56 and my machine looks like a 56. What were the differences
between the two? What mixture does it take? Can you use unleaded with
oil? Many thanks Pete