G'day Rob.
This was posted in the forum by DD
Fred Rist was one of BSA's star riders in the immediate post war period,
competing in every event the factory contested and was one of the team who
won the 1952 Maudes Trophy winning team. Fred only ever raced BSA
machinery. In the late 1940's Fred also competed in sand racing events at
Pendine and St. Andrews in Scotland and swept the board. Fred's impact on the
sport was due not just to his successes but also his dramatic riding style.
Laying the bike down on a footrest in a way similar to that of US dirt track racers
Fred would drive through corners in a controlled power slide at speeds of
140mph.One of the bikes Fred rode was an iron engined A10 fitted with twin TT
carburettors, high compression pistons and running on alcohol fuel and it's this
bike that was used as the blueprint for Gene's bike. I don't know which
mechanics actually built the bike but it's likely that it used a one-off camshaft
made by Jack Amott. Gene told me that he thinks that other than bigger valves,
a different cam, a bigger TT carburettor and dope fuel, everything else was
standard components built well.
Here
https://www.a7a10.net/forum/index.php?topic=8593.0JulianM may have pictures but hasn't surfaced here for nearly 2 years.
Cheers