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Velocette Venom Scrambler

Make Model	Velocette Venom Scrambler
Year	1958
Engine	Four stroke, single cylinder
Capacity	499 cc / 30.5 cub in
Bore x Stroke	86 x 86 mm
Compression Ratio	8.75:1
Cooling System	Air cooled
Lubrication	Dry sump
Carburetor	Amal 10TT9 Monobloc
Exhaust	Single
Spark Plug	Champion N3 or N4
Ignition	BTH racing magneto
Starting	Kick start
Max Power	28.7 kW / 39 hp @ 6200 rpm
Transmission	4 Speed constant mesh, close ratio
Gear Ratios	1st 16.65 / 2nd 11.41 / 3rd 8.58 / 4th 7.2:1
Final Drive	Chain
Frame	Tubular cradle, rear sub-frame detachable
Dimensions	Length: 2260 mm / 89.0 in Width: 890 mm / 34.5 in Height: 1090 mm / 43.0 in
Wheelbase	1365 mm / 53.75 in
Ground Clearance	165 mm / 6.5 in
Seat Height	838 mm / 33 in
Front Suspension	Telescopic fork with hydraulic damping and an offset wheel spindle
Rear Suspension	Woodhead-Monroe springs with hydraulic damping, later Armstrong and Girling
Front Brakes	7 x 1 in. drum
Rear Brakes	7 x 1 in. drum
Front Wheel	WM1 x 21 in
Rear Wheel	WM3 x 19 in
Front Tyre	3.25 x 19 in or 3.00 x 21 in knobbies, Avon or Dunlop
Rear Tyre	4.00 x 19 in knobbies, Avon or Dunlop
Dry Weight	152 kg / 335 lbs
Fuel Capacity	11.35 L / 3 US gal
Colours	Black with silver tank
Source	Wikipedia, Southriders-mc

Before the sixties, motorcycle manufacturers usually used the same chassis for road and off-road bikes. Dirt bikes were often modified from road or race bikes.

The Velocette development team built Venom off-road motorcycles, which were sent to the United States for evaluation in enduro events. Built with the slogan "A winner in every respect", the Scrambler had a specially lightened frame, light alloy mudguards and high-level enduro-style exhaust pipes. A special off-road Venom was named the Endurance. Fitted with the Venom engine, it had a 21-inch front wheel, high handlebars and a small fuel tank, as well as full lighting so that it could be legally used on the roads.

The Velocette scrambler was a factory-made machine based on the 500 MSS. The standard power of 18 hp was doubled to 35 hp by using of certain components from the more powerful Venom: in particular the camshaft, magneto and carburettor.