Velocette Viper

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Velocette-viper-02.jpg
Velocette Viper
Manufacturer
Production 1955 - 68
Engine
Four stroke, single cylinder
Compression ratio 8.0:1
Top Speed 91 mph
Ignition Belt driven dynamo, after 1962: Lucas system
Spark Plug KLG FE100 / Champion N3 / NGK B8ES, Lodge 3HLN
Battery 6V
Transmission 4 Speed constant mesh, close ratio
Suspension Front: Telescopic fork with hydraulic compression and rebound damping
Rear: Woodhead-Monroe springs with hydraulic damping, later Armstrong and Girling, adjustable
Brakes Front: 7.5 x 1.5 in., drum
Rear: 7 x 1 in., drum
Front Tire 3.25 x 19 in
Rear Tire 3.25 x 19 in
Wheelbase 1353 mm / 53.25 in
Weight 165 kg / 364 lbs (dry),
Fuel Capacity 13.6 L / 3.6 US gal
Manuals Service Manual


It could reach a top speed of 91 mph.

Engine[edit | edit source]

The engine was a Air cooled cooled Four stroke, single cylinder. The engine featured a 8.0:1 compression ratio.

Drive[edit | edit source]

Power was moderated via the Dry, three-plate.

Chassis[edit | edit source]

It came with a 3.25 x 19 in front tire and a 3.25 x 19 in rear tire. Stopping was achieved via 7.5 x 1.5 in., drum in the front and a 7 x 1 in., drum in the rear. The front suspension was a Telescopic fork with hydraulic compression and rebound damping while the rear was equipped with a Woodhead-Monroe springs with hydraulic damping, later Armstrong and Girling, adjustable. The Viper was fitted with a 13.6 L / 3.6 US gal fuel tank. The bike weighed just 165 kg / 364 lbs. The wheelbase was 1353 mm / 53.25 in long.

Photos[edit | edit source]

Velocette Viper Velocette Viper

Overview[edit | edit source]

Make Model Velocette Viper
Year 1955 - 68
Engine Type Four stroke, single cylinder
Displacement 349 cc / 30.5 cub in
Bore X Stroke 72 x 86 mm
Compression 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 Tire 3.25 x 19 in
Rear Tire 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

Videos[edit | edit source]