At the heart of the 2020 Janus Halcyon 250 allround motorcycle, Janus features a 229 cc (14 cu in) air-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 14 HP (10.2 kW) at 7,000 rpm while maximum torque reaches 15.8 Nm (11.7 lb-ft) at 5,500 rpm, transferring power to the rear wheel through chain final drive. With a specific output of 61.1 HP per liter and a 1,500 rpm working window between peak torque (5,500 rpm) and peak power (7,000 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 Halcyon 250 measures 119.3 kg (263 lbs) dry, translating to a power-to-weight ratio of 0.12 HP/kg (8.52 kg per horsepower). Rider ergonomics and chassis geometry center around a 787 mm (31 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,346 mm (53 in) wheelbase engineered for quick, flickable steering geometry. The 7.34-liter (1.9 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 113 km/h (70 mph).
Within MotoLibrary's Janus archive, this model family spans 3 indexed model years from 2020 to 2023, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
61.1 HP/L
Power-to-Weight
0.12 HP/kg (8.52 kg/HP)
Power Band Window
5,500–7,000 rpm
Standover Height
787 mm (31 in)
Engine
Displacement229.0 ccm (13.97 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power14.0 HP (10.2 kW)) @ 7000 RPM
Torque15.8 Nm (1.6 kgf-m or 11.7 ft.lbs) @ 5500 RPM
Compression9.2:1
Bore x Stroke67.0 x 65.0 mm (2.6 x 2.6 inches)
Fuel SystemCarburettor. 30mm round slide with accelerator pump
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionCDI
CoolingAir
Transmission
Final DriveChain (final drive)
ClutchWet multiplate
Performance
Top Speed112.7 km/h (70.0 mph)
Chassis
Frame TypeDOM tubular steel cradle
Front SuspensionProprietary dual progressive shock leading-link
Rear SuspensionHardtail with sprung seat
Wheelbase1346 mm (53.0 inches)
Wheels & Brakes
Front Tyre3-18
Rear Tyre3.5-18
Front BrakesDouble disc
Rear BrakesSingle disc
Dimensions & Weight
Dry Weight119.3 kg (263.0 pounds)
Power/Weight0.1174 HP/kg
Seat Height787 mm (31.0 inches) If adjustable, lowest setting.
Overall Height1041 mm (41.0 inches)
Overall Length2032 mm (80.0 inches)
Overall Width787 mm (31.0 inches)
Fuel Capacity7.34 litres (1.94 US gallons)
Other
StarterElectric & kick
Color OptionsBritish Racing Green, Vintage Red, Aga Cream, Black, American Blue, Charcoal, Olive, Cardinal Red
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.
