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Motorworld’s newspaper № 6

In the fall of 1909, Norton Motors Ltd. presented one of its most successful, long-term models called Model 1 (it was also known as Big Four 633). This motorcycle was mostly intended for use with a sidecar. Model 1 was the first motorcycle made by Norton Motors Ltd. From 1907 to 1954, the Big Four 633 was manufactured in many modifications.

The Big Four 633 was equipped with a one-cylinder, L-head, 633-cc engine having a size of 82 by 120 mm. Originally it was a belt-driven model, but somewhat later on, in 1915, the belt was replaced by a chain. In 1932, the right-side exhaust system was designed and next year a 4-speed gearbox.

The Big Four 633 was James Norton’s favorite motorcycle model. In the early 1930s, he drove with it several thousand miles around South Africa, hoping that fresh wind and staying away from smoke-filled Birmingham would improve his health. After his return to England, an advanced model was created.

Some 4,737 motorcycles (out of 100 thousand assembled) had sidecars that could carry two or three men with fighting equipment and munitions.

After WWII was over, the company went on to produce this model for 9 more years. In 1954, the production plant of Norton Motors Ltd. started manufacturing twin-cylinder motorcycles putting an end to the production of Big Four 633.

Manufacturer Norton Motors Ltd., Birmingham (Great Britain)
Years of manufacture 1938 – 1945
Quantity produced, units 4 737
Price 162 £
Today’s value 10 549,8 $
ENGINE AND TRANSMISSION
Type 1-cylinder, L-head
Engine capacity, cc 633
Bore and stroke, mm 82 х 120
Engine rating 14.5 h.p. at 4000 rpm
Sparking Magneto, right-side kickstarter arrangement
Carburetor Amal 276
Battery 6 V
Clutch Multiple-plate, oil-bath
Transmission 4-speed
FRAME AND WHEELBASE
Frame type Tubular
Front suspension Parallelogram, with frictional damper
Rear suspension Rigid
Brakes Drum type
Wheel size 4,00 х 18 (3 wheels)
DIMENSIONS
Length, mm
2 184
Width, mm
1 689
Height, mm
1 168
Wheelbase, mm
1 371
Ground clearance, mm
   127
Seat height, mm
   820*
Mass, kg
   308
Gas tank size, l
     14
Maximum speed, km/h
     90
Range, km
   

* – Data from the results of the measurement of the “Motorworld by V.Sheyanov” exhibit.