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Model Range
The 2 h.p. model was dropped from the range, and the 3 h.p. model was redesigned and produced in 'Standard' and TT versions. The former model was also produced for the War Department as a 'General Service' model (engines stamped 'GS').

Marstons issued both pre-season and mid-season catalogues. The mid-season catalogue introduced a re-engined  v-twin model, an AKD (Abingdon King Dick) engine of 798cc replacing the JAP engine from the previous year. War production was making JAP engines hard to come by.

Cycle Parts
[text to follow]

Engine and Gearbox
The most notable visual change was the new parallel-sided magneto chain drive cover for the single cylinder machines.

* Robert Cordon Champ, 1980, 'The Sunbeam Motorcycle'. Haynes Publishing.



T H E   Y E A R ' S   M O D E L S  
3 h.p. Standard model / War Department GS (General Service) model


3 h.p. TT model


6 h.p. (770cc) JAP v-twin model


6 h.p. (798cc) AKD v-twin model


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