A combination of the Longstroke's 105.5 mm stroke and
the Standard model's 85 mm bore produced a larger engined 596cc motorcycle
intended for side car work. From 1924 it was designated the 'Model 7'. This
replaced the JAP-engined v-twin in the company's model range. It was a
splendid “slogger” which pulled great weights and lasted seemingly forever.
Famously, the Model 7 Sunbeam continued into the early
1930s as a flat tank machine, well after the universal change to saddle tank
motorcycle design in the late 1920s. In 1932 it was replaced by the 598cc
version of the saddle tank Lion, known as the 'Model 7A', and later simply
as the '600cc Lion'.