There was no change from 1924's offering in what Robert Cordon Champ
calls 'an impressive catalogue' from Sunbeam.
over-head camshaft (OHC) machine
was entered for the year's Senior and Side-car T.T. races but performed badly and was not
developed. A small batch of the 500cc OHC engines was produced along with a
single 600cc version for the T.T and an experimental 350cc version for
evaluation. The OHC engine was not put into production.
A front drum brake, introduced for OHV machines the previous year, became
standard across the range, even on the Model 7.
Engine and gearbox
[text to be added].
* Robert Cordon Champ, 1980, 'The Sunbeam Motorcycle'. Haynes Publishing.
* Robert Cordon Champ, 1989, 'The Illustrated History of Sunbeam
Bicycles and Motorcycles'. Haynes Publishing.