These are the known mechanical and performance specifications for your 2011 Dafier Crazy 50.
Basic Specs

Engine
Displacement49.90 ccm (3.04 cubic inches)
Type
DetailsSingle cylinder, two-stroke
Max RPM
Compression7.0:1
Bore/Stroke40.3 x 39.0 mm (1.6 x 1.5 inches)
Valves/Cylinder
FuelingCarburettor
IgnitionC.D.I.
Exhaust
Lubrication
CoolingLiquid
Performance
Horespower4.29 HP (3.1 kW)
Torque
Top Speed45.0 km/h (28.0 mph)
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity4.50 litres (1.19 gallons)
Emissions
Chassis
Frame TypeSteel
Rake
Trail
Front SuspensionTelescopic fork
Front Travel
Rear Suspension
Rear Travel
Seat
Seat Height
Alt. Seat Height
Total Height1,035 mm (40.7 inches)
Total Length1,860 mm (73.2 inches)
Total Width740 mm (29.1 inches)
Ground Clearance
Wheelbase1,295 mm (51.0 inches)
Dry Weight105.0 kg (231.5 pounds)
Wet Weight
Wheels & Brakes
Front Tire/Tyre120/70-12
Rear Tire/Tyre130/70-12
Front BrakesSingle disc
Front Brake Diameter
Rear BrakesExpanding brake (drum brake)
Rear Brake Diameter
WheelsBlack rims
Comments
Chinese brand