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Sunbeam Model 3

Make Model.	Sunbeam Model 3
Year	1915 - 26
Engine	Single cylinder, side valve
Capacity	499 cc / 30.5 cu in
Bore x Stroke	85 x 88 mm
Cooling System	Air cooled
Exhaust	Single
Starting	Kick
Power	2.6 kW / 3.5 hp
Transmission	3-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

With a number of changes, notably a chain-driven magneto, the 3½ h.p. model became a 'General Service' machine for the War Department during the First World War.

With further changes and refinements this 499cc model remained in continuous production into the post-war years until 1926. It was designated the 'Model 3' when Marston introduced model numbers in 1924.