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Velocette Viper

Make Model	Velocette Viper
Year	1955 - 68
Engine	Four stroke, single cylinder
Capacity	349 cc / 30.5 cub in
Bore x Stroke	72 x 86 mm
Compression Ratio	8.0:1
Cooling System	Air cooled
Lubrication	Wet sump
Exhaust	Single
Spark Plug	KLG FE100 / Champion N3 / NGK B8ES, Lodge 3HLN
Battery	6V
Ignition	Belt driven dynamo, after 1962: Lucas system
Starting	Kick start
Max Power	25 kW / 28 hp @ 7000 rpm
Clutch	Dry, three-plate
Transmission	4 Speed constant mesh, close ratio
Final Drive	Chain
Wheelbase	1353 mm / 53.25 in
Front Suspension	Telescopic fork with hydraulic compression and rebound damping
Rear Suspension	Woodhead-Monroe springs with hydraulic damping, later Armstrong and Girling, adjustable
Front Brakes	7.5 x 1.5 in., drum
Rear Brakes	7 x 1 in., drum
Front Wheel	WM2 x 19
Rear Wheel	WM2 x 19
Front Tyre	3.25 x 19 in
Rear Tyre	3.25 x 19 in
Turning Radius	4.9 m / 16 ft.
Rake	27°
Fuel Capacity	13.6 L / 3.6 US gal
Dry Weight	165 kg / 364 lbs
Top Speed	91 mph
Colours	Willow green
Source	Wikipedia

Introduced in October 1955, the single-cylinder Viper was developed from the 349cc Velocette MAC. Designed by Charles Udall, the Viper's 349cc engine had a bi-metal cylinder with a cast iron liner, high compression piston and a light alloy cylinder head. Using the same bottom end as its sister bike the 500cc Velocette Venom, the Viper had a lot of chrome plating and was offered in a choice of black or "willow green" paintwork. The Viper was also ahead of its time in being one of the first to have glass fibre enclosure panels from 1962. These panels proved unpopular with the traditional buyers of Velocette singles, as they extended from the front of the engine, level with the top of the crankcase, to the rear pillion footrests.