These are the known mechanical and performance specifications for your 1974 Norton MK2A 850 Commando Roadster.
Basic Specs


Year1974
MakeNorton
ModelNorton MK2A 850 Commando Roadster
TypeSport
CostUS$ 1900. Prices depend on country, taxes, accessories, etc.
Engine
Displacement828.00 ccm (50.52 cubic inches)
TypeSame engine as the Interstate
DetailsTwin, four-stroke
Max RPM7500
Compression8.5:1
Bore/Stroke77.0 x 89.0 mm (3.0 x 3.5 inches)
Valves/Cylinder2
FuelingCarburettor. Twin Amals
Ignitionpoints
ExhaustDouble chrome pipes
LubricationDry sump
CoolingAir
Performance
Horespower60.00 HP (43.8 kW)
Torque
Top Speed189.9 km/h (118.0 mph)
Fuel Economy & Polution
Fuel Consumption5.11 litres/100 km (19.6 km/l or 46.03 mpg)
Fuel Capacity11.36 litres (3.00 gallons)
Emissions118.6 CO2 g/km. (CO2 - Carbon dioxide emission)
Chassis
Frame TypeDouble cradle, large back bone steel, with Isolastic vibration system
Rake
Trail
Front SuspensionTelescopic
Front Travel152 mm (6.0 inches)
Rear SuspensionTwin shocks
Rear Travel76 mm (3.0 inches)
Seat
Seat Height787 mm (31.0 inches) If adjustable, lowest setting.
Alt. Seat Height
Total Height
Total Length2,235 mm (88.0 inches)
Total Width
Ground Clearance152 mm (6.0 inches)
Wheelbase1,440 mm (56.7 inches)
Dry Weight188.2 kg (415.0 pounds)
Wet Weight199.6 kg (440.0 pounds)
Wheels & Brakes
Front Tire/Tyre
Rear Tire/Tyre
Front BrakesSingle disc
Front Brake Diameter
Rear BrakesExpanding brake (drum brake)
Rear Brake Diameter
WheelsSpoke
Comments
English bike. Last of the kick start Commandos. Shifts on the right side. 1 up 3 down