Key performance
Technical specifications
Engine
- Displacement
- 229 cc
- Torque
- 15.8 Nm
- Engine type
- Single cylinder, four-stroke
- Cooling
- Air
- Compression ratio
- 9.2:1
- Bore × stroke
- 67.0 x 65.0 mm (2.6 x 2.6 inches)
- Fuel system
- Carburettor. 30mm round slide with accelerator pump
- Valve timing
- Overhead Valves (OHV)
- Ignition
- CDI
- Starter
- Electric & kick
Chassis
- Frame
- DOM tubular steel cradle
- Gearbox
- 5-speed
- Final drive
- Chain (final drive)
- Clutch
- Wet multiplate
- Front suspension
- Proprietary dual progressive shock leading-link
- Rear suspension
- Hardtail with sprung seat
Brakes
- Front brakes
- Double disc. 2 piston caliper
- Rear brakes
- Single disc. Single Piston
- Front tyre
- 3.00-18
- Rear tyre
- 3.50-18
Dimensions
- Seat height
- 787.00 mm
- Wheelbase
- 1346.00 mm
- Length
- 2032.00 mm
- Width
- 787.00 mm
- Height
- 1041.00 mm
- Fuel capacity
- 7.34 L
- Dry weight
- 119.30 kg
Overview
In a world obsessed with power and electronics, the Janus Halcyon 250 slams a door with a refreshing insolence. Its carbureted 229 cc single-cylinder engine, with a square bore of 67 x 65 mm and a compression ratio contained to 9.2:1, is a statement of intent. It’s not about delivering crazy figures, but an experience. The announced torque of 15.8 Nm, well distributed, and a top speed limited to 113 km/h outline the contours of a motorcycle focused on the essentials. It rejects noisy progress in favor of a direct mechanical conversation, transmitted by a five-speed gearbox and a chain final drive.

Its DOM steel tubular chassis and progressive telescopic front suspension are aesthetic choices as much as technical ones. They define a geometry dedicated to comfort and stability, with a long wheelbase of 1346 mm. The braking, ensured by two front discs and one rear disc, is more than sufficient for the speeds the engine allows. 18-inch, thin and classic tires complete this picture of a motorcycle designed for the pleasure of straight lines and wide turns, not for attacking mountain passes. At 119 kg dry and with a 787 mm seat height, it is accessible and light, an effortless urban or country companion.
The displayed consumption, 3.14 liters per hundred kilometers, is the seal of this philosophy. This frugality, coupled with a 7.3-liter tank, offers modest but consistent range with its cruising use. The hardtail version, with its sprung seat, pushes the retro exercise to the end, for better or for worse. It is aimed at those who seek the purity of a line, even if it means sacrificing a little comfort. Faced with a Royal Enfield Meteor 350, more versatile and powerful, or Japanese neo-classics, the Halcyon 250 assumes its role as a singular, almost anachronistic object.
The Janus Halcyon 250 is a manifesto on two wheels. It will not convince the hurried commuter or the novice looking for an easy first machine. Its audience is that of the collector, the aesthete, the rider who finds happiness in the slow rhythm and dialogue with simple mechanics. It is a motorcycle for short but intense journeys, those where you arrive less quickly, but differently. It proves that there is still room, even in 2023, for a machine that prefers charm to performance.
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