Technical specifications
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| Model: |
Viper |
| Years: |
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:
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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:
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Kick start
|
|
Max Power:
|
25 kW / 28 hp @ 7000 rpm
|
|
Clutch:
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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
|
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Source:
|
Wikipedia
|