At the heart of the 2011 AJS Crazy Naked 50 scooter motorcycle, AJS relies on a 40 cc (2.4 cu in) air-cooled single cylinder, two-stroke powerplant. In factory specification, peak output is rated at 3.5 HP (2.5 kW) at 7,000 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. Internal engine geometry specifies a bore and stroke of 40.0 x 39.2 mm (1.6 x 1.5 inches).
On the scales, the Crazy Naked 50 measures 90 kg (198 lbs) dry. Rider ergonomics and chassis geometry center around a 775 mm (30.5 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,290 mm (50.8 in) wheelbase engineered for quick, flickable steering geometry. The 5-liter (1.3 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 48 km/h (30 mph).
Standover Height
775 mm (30.5 in)
Engine
Displacement40.0 ccm (2.44 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power3.5 HP (2.5 kW)) @ 7000 RPM
Bore x Stroke40.0 x 39.2 mm (1.6 x 1.5 inches)
Fuel SystemCarburettor
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionCoil CDI
CoolingAir
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
ClutchTwist and go.
Performance
Top Speed48.3 km/h (30.0 mph)
Chassis
Frame TypeSteel
Front SuspensionTelescopic fork
Rear SuspensionSingle shocks
Wheelbase1290 mm (50.8 inches)
Wheels & Brakes
Front Tyre120/70-12
Rear Tyre130/70-12
Front BrakesSingle disc
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight90.0 kg (198.4 pounds)
Power/Weight0.0388 HP/kg
Seat Height775 mm (30.5 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
