Ariel FH 650 - Specifications & Review

FH 650

Article Complete Info

Articleid216225
CategoryAllround
MakeAriel
ModelFH 650
Year1954

Chassis, Suspension, Brakes & Wheels

FrametypeDuplex down tubes, swingarm
FrontbrakesExpanding brake (drum brake)
FrontsuspensionTelescopic fork, hydraulic
Fronttyre3.25-19
RearbrakesExpanding brake (drum brake)
RearsuspensionDual coil springs
Reartyre3.50-19
WheelsSteel, wire spokes

Engine & Transmission

Borexstroke70.0 x 84.0 mm (2.8 x 3.3 inches)
Compression6.5:1
CoolingsystemAir
Displacement646.00 ccm (39.42 cubic inches)
EnginedetailsTwin, four-stroke
EnginetypeBSA A10 engine
ExhaustsystemTwin pipe
Fuelconsumption5.10 litres/100 km (19.6 km/l or 46.12 mpg)
FuelsystemCarburettor. Amal
Gearbox4-speed
Greenhousegases118.3 CO2 g/km. (CO2 - Carbon dioxide emission)
IgnitionMagneto
LubricationsystemDry sump, two pumps
Power35.00 HP (25.5 kW)) @ 5600 RPM
Topspeed148.9 km/h (92.5 mph)
TransmissiontypefinaldriveChain

Other Specifications

ColoroptionsRed
StarterKick

Physical Measures & Capacities

Dryweight181.0 kg (399.0 pounds)
Fuelcapacity15.14 litres (4.00 gallons)
Groundclearance140 mm (5.5 inches)
Oilcapacity2.30 litres (0.15 quarts)
Powerweightratio0.1934 HP/kg
Seatheight787 mm (31.0 inches) If adjustable, lowest setting.

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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