Sunbeam Model 6 Lion (1921-37)

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The Sunbeam Model 6 “Lion” motorcycle was manufactured from 1921 to 1937 with an air-cooled, single-cylinder, side valve engine that had a capacity of 492 cc. The compression ratio was 5.0:1 and it had a single exhaust with kick starting, producing 3.4 kW / 4.5 hp power. The transmission was a 3-speed wide ratio with a final drive via chain. The frame was a single downtube cradle and it had Druid forks for the front suspension and rigid spring-loaded saddle for the rear. The front and rear brakes were drums, and the wheels were steel with laced wire spokes. The standard tyres were 3.25 x 26″ but an optional 3.50 x 26″ was available. The dimensions were 2083 mm / 82″ in length, 813 mm / 32″ in width, with a wheelbase of 1359 mm / 53.5″, and a saddle height of 711 mm / 28″. The dry weight was 136 kg / 300 lbs, and it had a fuel capacity of 11.4 L / 2.5 Imp gal / 3.0 US gal and an oil capacity of 2.3 L / 4.0 Imp pt / 4.8 US pt.

Technical specifications:

Make Model: Sunbeam Model 6 “Lion”

Year: 1921 – 37


Engine: Single cylinder, side valve
Capacity: 492 cc / 30.0 cu in
Bore x Stroke: 77 x 105.5 mm
Cooling System: Air cooled
Compression Ratio: 5.0:1
Exhaust: Single
Starting: Kick
Power: 3.4 kW / 4.5 hp
Transmission: 3-Speed wide ratio
Final Drive: Chain
Gear Ratios: 1st 13.7 / 2nd 8.2 / 3rd 4.9:1 (Side car model: 1st 14.6 / 2nd 8.7 / 3rd 5.25:1 or 15.5, 9.3 and 5.6)
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
Tyres, Front and Rear: 3.25 x 26″ (Optional: 3.50 x 26″)
Dimensions: Length: 2083 mm / 82″ Width 813 mm / 32″
Wheelbase: 1359 mm / 53.5″
Saddle Height: 711 mm / 28″
Dry Weight: 136 kg / 300 lbs
Fuel Capacity: 11.4 L / 2.5 Imp gal / 3.0 US gal
Oil Capacity: 2.3 L / 4.0 Imp pt / 4.8 US pt
Source: Sunbeamsidevalve.com

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