Built around AJS's allround motorcycle platform, the 2025 AJS Tempest Roadster 125 features a 124 cc (7.6 cu in) air-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 9.5 HP (6.9 kW) at 8,500 rpm while maximum torque reaches 9.5 Nm (7 lb-ft) at 6,500 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 76.6 HP per liter and a 2,000 rpm working window between peak torque (6,500 rpm) and peak power (8,500 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the Tempest Roadster 125 measures 126 kg (278 lbs) dry, translating to a power-to-weight ratio of 0.08 HP/kg (13.26 kg per horsepower). Rider ergonomics and chassis geometry center around a 780 mm (30.7 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,330 mm (52.4 in) wheelbase engineered for quick, flickable steering geometry. The 16-liter (4.2 US gal) fuel tank paired with a rated consumption of 1.84 L/100 km provides an estimated theoretical range of roughly 870 km (541 miles) between fill-ups, while factory top speed is listed at 97 km/h (60 mph).
Within MotoLibrary's AJS archive, this model family spans 4 indexed model years from 2018 to 2025, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
76.6 HP/L
Power-to-Weight
0.08 HP/kg (13.26 kg/HP)
Power Band Window
6,500–8,500 rpm
Theoretical Range
~870 km (541 mi)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power9.5 HP (6.9 kW)) @ 8500 RPM
Torque9.5 Nm (1.0 kgf-m or 7.0 ft.lbs) @ 6500 RPM
Bore x Stroke54.0 x 54.0 mm (2.1 x 2.1 inches)
Fuel SystemInjection
Fuel ControlOverhead Cams (OHC)
CoolingAir
Transmission
Gearbox5-speed
Final DriveChain (final drive)
ClutchWet, multiplate
Performance
Top Speed96.6 km/h (60.0 mph)
Fuel Consumption1.84 litres/100 km (54.3 km/l or 127.84 mpg)
Greenhouse Gases42.7 CO2 g/km. (CO2 - Carbon dioxide emission)
Emission DetailsEuro 5
ExhaustStainless steel
Chassis
Frame TypeSteel
Front SuspensionTelescopic fork
Rear SuspensionDual shocks
Wheelbase1330 mm (52.4 inches)
Wheels & Brakes
Front Tyre110/70-17
Rear Tyre130/70-17
Front BrakesSingle disc. Combined braking system
Front Brake Ø300 mm (11.8 inches)
Rear BrakesSingle disc
Rear Brake Ø210 mm (8.3 inches)
WheelsSpoked wheels with alloy rims
Dimensions & Weight
Dry Weight126.0 kg (277.8 pounds)
Power/Weight0.0756 HP/kg
Seat Height780 mm (30.7 inches) If adjustable, lowest setting.
Overall Height1110 mm (43.7 inches)
Overall Length2040 mm (80.3 inches)
Overall Width800 mm (31.5 inches)
Fuel Capacity16.00 litres (4.23 US gallons)
Other
StarterElectric & kick
Color OptionsMetallic Blue, Metallic Dark Red, Jet Black
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.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
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.
