Model Range
Two new models were introduced for 1922: the 'Longstroke' in its T.T. form, and the 4½
h.p. model which combined the stroke of the Longstroke with the old pattern 3½
h.p. cylinder bore. The result was a 596cc machine (88 x 105.5 mm) which was to remain
in production until the 1930s as the last flat tank motorcycle available
from Marston - and possibly any other major manufacturer.
Three versions of the 'square'-stroked 3½ h.p. side-valve
model continued to be offered as previously in 1921, the T.T. model now
simply called the 'Sporting Solo'. Along with these, the 8 h.p.
v-twin JAP engined machine continued to be available for heavy sidecar work.
Cycle Parts
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Engine and Gearbox
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Sources:
* Robert Cordon Champ, 1980, 'The Sunbeam Motorcycle'. Haynes Publishing.
* Robert Cordon Champ, 1989, 'The Illustrated History of Sunbeam Bicycles
and Motorcycles'. Haynes Publishing. |