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 |
