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.

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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