Norton International (1955)

The Norton International Model 30 is a four-stroke, single cylinder, SOHC motorcycle with a capacity of 490.1 cc/29.9 cu in. It has a cooling system of air cooled with a compression ratio of 7.23:1. The PAzin Amal TT carburetors fuel the engine while the Lucas dynamo controls the ignition. It uses a kick starter to start and has a maximum power of 22 kW/29.5 hp at 5500 rpm. It has a 4-speed, close ratio transmission with a final drive of a chain with gear ratios of 1st 10.8/2nd 6.18/3rd 5.1/4th 4.64:1. The frame is a cradle type with a front suspension of a road holder telescopic fork and an undamped plunger for the rear suspension. Both the front and rear brakes are drums with steel laced wire-spoke wheels. It has a front rim of 3.00 x 21″ and a rear rim of 3.50 x 20″. The wheelbase is 1410mm/55.5 in and it has a dry weight of 176 kg/390 lbs. It can reach a top speed of 156 km/h/97 mph.

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Technical specifications:

Make Model: Norton International Model 30

Year: 1955

Engine: Four stroke, single cylinder, SOHC

Capacity: 490.1 cc / 29.9 cu in

Bore x Stroke: 79 x 100 mm

Cooling System: Air cooled

Compression Ratio: 7.23:1

Induction: PAzin Amal TT carburetors

Ignition: Lucas dynamo

Starting: Kick

Max Power: 22 kW / 29.5 hp @ 5500 rpm

Transmission: 4-Speed, close ratio

Final Drive: Chain

Gear Ratios: 1st 10.8 / 2nd 6.18 / 3rd 5.1 / 4th 4.64:1

Frame: Cradle type

Front Suspension: Roadholder telescopic fork

Rear Suspension: Undamped plungers

Front Brakes: Drum

Rear Brakes: Drum

Wheels: Steel, laced wire spokes

Front Rim: 3.00 x 21″

Rear Rim: 3.50 x 20″

Wheelbase: 1410 mm / 55.5 in

Dry Weight: 176 kg / 390 lbs

Top Speed: 156 km/h / 97 mph