Positioned in AJS's scooter motorcycle lineup, the 2015 AJS Firefox 50 pairs a 49 cc (3 cu in) air-cooled single cylinder, two-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 3 HP (2.2 kW) at 8,000 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. Internal engine geometry specifies a bore and stroke of 39.0 x 41.5 mm (1.5 x 1.6 inches).
On the scales, the Firefox 50 measures 85 kg (187 lbs) dry. Rider ergonomics and chassis geometry center around a 735 mm (28.9 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,320 mm (52 in) wheelbase engineered for quick, flickable steering geometry. The 4.7-liter (1.2 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 50 km/h (31 mph).
Within MotoLibrary's AJS archive, this model family spans 3 indexed model years from 2012 to 2020, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
735 mm (28.9 in)
Engine
Displacement49.0 ccm (2.99 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power3.0 HP (2.2 kW)) @ 8000 RPM
Bore x Stroke39.0 x 41.5 mm (1.5 x 1.6 inches)
Fuel SystemCarburettor
CoolingAir
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
DrivelineCVT Automatic
Performance
Top Speed49.9 km/h (31.0 mph)
Chassis
Frame TypeSteel
Front SuspensionTelescopic fork
Rear SuspensionSingle shock
Wheelbase1320 mm (52.0 inches)
Wheels & Brakes
Front Tyre3.50-12
Rear Tyre3.50-12
Front BrakesSingle disc
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight85.0 kg (187.4 pounds)
Power/Weight0.0353 HP/kg
Seat Height735 mm (28.9 inches) If adjustable, lowest setting.
Fuel Capacity4.70 litres (1.24 US gallons)
Other
StarterElectric & kick
Color OptionsWhite, blue
Electrical12V 6Ah battery.
Carrying CapacityLockable storage space under the seat.. Rear rack. Optional top box.
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.
