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Sunbeam Model 7

Make Model.	Sunbeam Model 7 and 7A
Year	1922 - 40
Engine	Single cylinder, side valve
Capacity	596 cc / 36.4 cu in
Bore x Stroke	77 x 105.5 mm
Cooling System	Air cooled
Exhaust	Single
Starting	Kick
Power	3.2 kW / 4.25 hp
Transmission	4-Speed
Final Drive	Chain
Frame	Single downtube cradle
Front Suspension	Druid forks
Rear Suspension	Rigid, spring loaded saddle
Front Brakes	Drum
Rear Brakes	Drum
Wheels	Steel, laced wire spokes
Source	Sunbeamsidevalve.com

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'.