These are the known mechanical and performance specifications for your 2011 E-max 120S.
Basic Specs

Engine
Displacement
Type13´´ high torque maintenance free motor.
DetailsElectric
Max RPM
Compression
Bore/Stroke
Valves/Cylinder
Fueling
Ignition
Exhaust
Lubrication
CoolingAir
Drivetrain
GearboxAutomatic
Final DriveShaft drive (cardan)
ClutchNo clutch
Driveline
Performance
Horespower6.03 HP (4.4 kW)
Torque
Top Speed65.0 km/h (40.4 mph)
Chassis
Frame Type
Rake
Trail
Front SuspensionOil/gas pressure
Front Travel
Rear SuspensionOil/gas pressure
Rear Travel
Seat
Seat Height
Alt. Seat Height
Total Height
Total Length
Total Width
Ground Clearance
Wheelbase
Dry Weight91.0 kg (200.6 pounds)
Wet Weight195.0 kg (429.9 pounds)
Wheels & Brakes
Front Tire/Tyre130/60-13
Rear Tire/Tyre130/60-13
Front BrakesSingle disc. Hydraulic floating disc brakes
Front Brake Diameter
Rear BrakesSingle disc. Hydraulic floating disc brakes
Rear Brake Diameter
WheelsAluminium rims
Comments
4 x 12V/60Ah silicone battery. 5 hours charging time. Operating range 90 km. Made in Germany.