Ariel NH 350 - Specifications & Review

NH 350

Article Complete Info

Articleid408716
CategoryAllround
MakeAriel
ModelNH 350
Year1945

Chassis, Suspension, Brakes & Wheels

FrametypeSemi-double cradle
FrontbrakesExpanding brake (drum brake)
FrontsuspensionTelescopic fork
Fronttyre3.00-20
RearbrakesExpanding brake (drum brake)
RearsuspensionPlungers
Reartyre3.25-19
SeatTwo-person seat

Engine & Transmission

Borexstroke72.0 x 85.0 mm (2.8 x 3.3 inches)
ClutchDry, multiplate
Compression6.2:1
CoolingsystemAir
Displacement346.00 ccm (21.11 cubic inches)
EnginedetailsSingle cylinder, four-stroke
Exhaustsystem1-into-1 pipes
FuelsystemCarburettor. Monoblack
Gearbox4-speed
IgnitionFlywheel
Power19.50 HP (14.2 kW)) @ 5800 RPM
Topspeed117.0 km/h (72.7 mph)
TransmissiontypefinaldriveChain

Other Specifications

ColoroptionsDark red
Electrical6V system.
StarterKick

Physical Measures & Capacities

Dryweight159.0 kg (350.5 pounds)
Fuelcapacity11.00 litres (2.91 gallons)
Overalllength2,180 mm (85.8 inches)
Powerweightratio0.1226 HP/kg

About Ariel

Country of Origin: United Kingdom
Founder: James Starley & William Hillman (bicycles); later Ariel Motorcycles under Charles Sangster
Best Known For: Square Four tourers, Red Hunter singles, and innovative early designs

Company History

Ariel is among Britain’s most storied names, moving from bicycles to motorcycles in the brass era and innovating through several epochs. The Red Hunter singles set a standard for sporting roadsters, while Edward Turner’s Square Four delivered creamy long-distance power from a compact four-cylinder layout. Postwar Ariels carried commuters and enthusiasts alike, with alloy cylinders and tidy frames that showcased the firm’s engineering finesse. The two-stroke Leader/Arrow of the late 1950s pushed modernity—enclosed bodywork, pressed steel, unit construction—foreshadowing scooters and lightweight commuters. Industry headwinds and consolidation into BSA/Triumph eventually ended motorcycle production in the late 1960s. In the 21st century, the Ariel name returned on radical lightweight cars and a boutique V-4 motorcycle prototype, channeling the brand’s historic appetite for bold design. Historically, Ariel symbolizes British ingenuity: elegant solutions to packaging and power delivery, a willingness to try new materials and layouts, and an understanding that motorcycles could be both fast and refined. A well-sorted Square Four remains a bucket-list ride—silky midrange, dignified pace, and the sense of traveling with civilized authority.

Other Years

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