Re: Sun motorcycles
Sun Motorcycles, like so many other MC firms, came out of older, bicycle, firms. The first Sun Motorcycle appeared in 1911 and continued in manufacture until 1933. After WWII with the dearth of cheap transport, Sun started again with a 'moped'. Like most of these, flimsy tin pressings housed a Villiers engine. In 1948 a lightweight motorcycle appeared, known as the Challenger. Sun produced many variants in the 50's, the 99cc Hornet, 224cc Cyclone and 249cc Wasp twin, there were competition variants too. In 1957, they jumped on the scooter craze with the 99cc Geni.
By 1960 however, like so many B'ham MC firms, Sun having been owned by one family since the start, they decided to retire. All manufacturing rights were sold to Raleigh, and any post 60 Bicycles came from Worksop.
Does that help ?