Sunbeam Model 10 Sprint (1931)

The Sunbeam Model 10 Sprint motorcycle was produced in 1931 and featured a single cylinder, air-cooled engine with a capacity of 344 cc. It had a compression ratio of 6.0:1 and was equipped with an AMAC carburetor, EIC magneto ignition, and wet sump lubrication. The bike had a 3-speed transmission with gear ratios of 15.2, 9.1, and 5.5:1, and a chain final drive. The frame had a single front down tube and the front suspension featured Druid forks. The rear suspension was rigid with a spring-loaded saddle and the front and rear brakes were both drum brakes. The wheels were made of steel with laced wire spokes and were fitted with 3.00 x 25″ Dunlop tires. The bike had a wheelbase of 1283 mm and overall dimensions of 2007 mm in length, 813 mm in width, and a saddle height of 711 mm. It weighed 105 kg when dry and had a fuel capacity of 9.1 L and an oil capacity of 1.1 L. Overall, the Sunbeam Model 10 Sprint was a well-built motorcycle with advanced features for its time.

Technical specifications:

Make Model: Sunbeam Model 10

Year: 1931
Engine: Single cylinder, OHV
Capacity: 344 cc / 21.0 cu in
Bore x Stroke: 74 80 mm
Cooling System: Air cooled
Compression Ratio: 6.0:1
Lubrication: Wet sump
Induction: AMAC carburettor
Exhaust: Single
Ignition: EIC Magneto
Starting: Kick
Power: 2.6 kW / 3.50 hp
Transmission: 3-Speed
Gear Ratios: 1st 15.2 / 2nd 9.1 / 3rd 5.5:1 (Options 14.3, 8.6 and 5.15 or 1605, 9.7 and 5.8)
Final Drive: Chain
Frame: Single front down tube
Front Suspension: Druid forks
Rear Suspension: Rigid, spring loaded saddle
Front Brakes: Drum, internal expanding
Rear Brakes: Drum, internal expanding
Wheels: Steel, laced wire spokes
Tyres, Front and B=Rear: 3.00 x 25″ Dunlop
Wheelbase: 1283 mm / 50.5″
Dimensions: Length: 2007 mm / 79.0″ Width: 813 mm / 32.0″
Saddle Height: 711 mm / 28.0″
Dry Weight: 105 kg / 231 lbs
Fuel Capacity: 9.1 L / 2.0 Imp gal / 2.4 US gal
Oil Capacity: 1.1 L / 2.0 Imp pt / 2.4 US pt
Source: Sunbeamsidevalve.com