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Jackson-Rotrax was a motorcycle produced by Alec Jackson from 1946 to approximately 1976.
This was a speedway machine that appeared after the end of the Second World War. Fitted with a 500cc JAP engine running on alcohol fuel, and a countershaft carrying the clutch mounted in a rigid frame, the machine was well finished and well made.
It was most successful in its task for many years, and although various engines were used, it was the JAP speedway engine, for which Jackson had acquired manufacturing rights in 1951, that predominated.
At a later date the engines were built by George Greenwood.
Sources: Graces Guide, et al.
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