Launched in 1935 as a 500cc sports version, Velocette MSS production was halted for World War II, but resumed in 1954. The post-war MSS was a modern machine with the same frame as the Velocette MAC. Lots of buyers tuned the MSS for speed and the factory responded by producing the sports Velocette Venom model. Burt Munro of The World's Fastest Indian
fame raced a heavily modified 1936 Velocette MSS. Munro made special pistons, changed the frame and increased engine capacity to 650 cc. He eventually hit a top speed of 138 mph and a 1/4 mile time of 12.31 seconds on his race-prepped MSS.