What category is the 2021 Janus Halcyon 450?

The 2021 Janus Halcyon 450 has a Category of Allround.

What is the engine size of the 2021 Janus Halcyon 450?

The 2021 Janus Halcyon 450 has a Capacity: of 445.0 ccm (27.15 cubic inches).

What type of engine does the 2021 Janus Halcyon 450 have?

The 2021 Janus Halcyon 450 has a Engine type of Single cylinder, four-stroke.

What is the engine power of the 2021 Janus Halcyon 450?

The 2021 Janus Halcyon 450 has a Power of 30.0 HP (21.9 kW) @ 7500 RPM.

What is the top speed of the 2021 Janus Halcyon 450?

The 2021 Janus Halcyon 450 has a Top speed of 144.8 km/h (90.0 mph).

Is the 2021 Janus Halcyon 450 air cooled or liquid cooled?

The 2021 Janus Halcyon 450 has a Cooling system of Air.

How much does the 2021 Janus Halcyon 450 weigh?

The 2021 Janus Halcyon 450 has a Dry weight of 160.6 kg (354.0 pounds).

What is the seat height of the 2021 Janus Halcyon 450?

The 2021 Janus Halcyon 450 has a Seat height of 762 mm (30.0 inches) If adjustable, lowest setting..

Janus Halcyon 450 - 2021 Specifications and Reviews

Name: 2021 Janus Halcyon 450
Brand: Janus

The 2021 Janus Halcyon 450 is a versatile all-rounder powered by a 445cc single-cylinder four-stroke engine producing 30 horsepower, making it ideal for novice and intermediate riders seeking an accessible middleweight. Its air-cooled design and straightforward mechanicals prioritize reliability and ease of maintenance, while the modest 144.8 km/h top speed ensures manageable performance for everyday riding and light touring.

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2021

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General information
Category	Allround
Year	2021
Model	Janus Halcyon 450

Engine and Transmission Specifications
Clutch	Wet multiplate
Transmission type	Chain (final drive)
Cooling system	Air
Lubrication system	Dry sump with gerotor pump, cartridge filter, and oil cooler
Ignition	CDI
Fuel control	Single Overhead Cams (SOHC)
Fuel system	Carburettor. Electronic injection
Compression	10.1:1
Top speed	144.8 km/h (90.0 mph)
Power	30.0 HP (21.9 kW) @ 7500 RPM
Engine type	Single cylinder, four-stroke
Capacity:	445.0 ccm (27.15 cubic inches)
Brakes, suspension, Frame and wheels
Rear brakes	Single disc. Single Piston caliper brembo
Diameter	280 mm (11.0 inches)
Front brakes	Double disc. Two-piston caliper Brembo
Rear tire	4.50-18
Front tire	4.00-18
Rear Suspension	Proprietary cantilever transom with dual progressive coil-over Ikon shocks
Front Suspension	Proprietary dual progressive shock leading-link
Frame type	DOM tubular steel cradle
Physical measures and capacities
Fuel capacity	7.57 litres (2.00 US gallons)
Wheelbase	1422 mm (56.0 inches)
Overall width	787 mm (31.0 inches)
Overall length	2184 mm (86.0 inches)
Overall height	1041 mm (41.0 inches)
Seat height	762 mm (30.0 inches) If adjustable, lowest setting.
Power/weight ratio	0.1868 HP/kg
Dry weight	160.6 kg (354.0 pounds)

Other specs
Maintenance	Find parts, fluids, filters, maintenance tools and service items on eBay
Factory warranty	2-year unlimited-mileage warranty
Starter	Electric
Color options	British Racing Green, Vintage Red, Aga Cream, Black, American Blue, Charcoal, Olive, Cardinal Red

Performance Profile & Rider Fit

26.8 hp

Peak Power

12.5s

0-60 mph

90 mph

Top Speed

Best For

Track15%

City70%

Cornering45%

Daily Riding65%

Touring40%

Passenger40%

Rider Profile

Best For	This bike suits new to intermediate riders who want a low-stress, low-power machine to build confidence on.
Purpose	It's built for relaxed cruising and everyday commuting rather than outright speed or long-distance touring.
Rider Fit	The low seat height and modest weight make it manageable for shorter or less physically strong riders.
Character	It has a classic, unhurried cruiser personality with simple mechanicals and a laid-back retro feel.
Not Ideal For	It's not for riders seeking highway-speed touring performance or any serious off-road capability.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2021 Janus Halcyon 450 Rider Ergonomics Assessment

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Inseam (optional)

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Feet:

At 762mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with both feet flat on the 2021 Janus Halcyon 450, with a moderate knee angle of around 115 degrees and a forward-leaning riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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Rider Reviews

Total comments: 1

MotorcycleDB Review

The 2021 Janus Halcyon 450 motorcycle is a stunning combination of classic design and modern performance. With its retro-inspired looks and powerful 450cc engine, this bike is a head-turner on the road. The attention to detail is evident in every aspect of the Halcyon 450, from its hand-built frame to its vintage-style components. Whether you're cruising around town or hitting the open road, this motorcycle delivers a smooth and comfortable ride, making it a joy to ride. The Janus Halcyon 450 motorcycle is a true testament to the craftsmanship and quality that Janus Motorcycles is known for. It's no wonder that this bike has garnered attention from enthusiasts and riders alike. With its timeless aesthetic and impressive performance, the 2021 Janus Halcyon 450 is a standout in the world of classic motorcycles. If you're in the market for a bike that offers a perfect blend of style and substance, look no further than the Janus Halcyon 450.