Ariel Square Four 500: history, specs, pictures

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Ariel Square Four 500
Also called 4F Square Four 500
Production 1931
square four cylinder
Bore / Stroke 51.0mm x 61.0mm
Top Speed 75 mph (120 km/h)
Fuel System carburetor. amal
Transmission Gear box: 4-speed
Final Drive: chain
Suspension Front: spring girders
Rear: rigid
Brakes Front: expanding brake (drum brake)
Rear: expanding brake (drum brake)
Front Tire 3.25-19
Rear Tire 3.25-19
Wheelbase 54.53 inches (1385 mm)
Length 82.68 inches (2100 mm)
Weight 425.49 pounds (193.0 Kg) (dry),
Fuel Capacity 3.5 Gallon (13.25 Liters)
Manuals Service Manual

The Ariel 4F Square Four 500 was a square four cylinder standard produced by Ariel in 1931. It could reach a top speed of 75 mph (120 km/h).


The engine was a air cooled square four cylinder. A 51.0mm bore x 61.0mm stroke result in a displacement of just 498.0 cubic centimeters. Fuel was supplied via a overhead cams (ohc).


The bike has a 4-speed transmission.


It came with a 3.25-19 front tire and a 3.25-19 rear tire. Stopping was achieved via expanding brake (drum brake) in the front and a expanding brake (drum brake) in the rear. The front suspension was a spring girders while the rear was equipped with a rigid. The 4F Square Four 500 was fitted with a 3.5 Gallon (13.25 Liters) fuel tank. The bike weighed just 425.49 pounds (193.0 Kg). The wheelbase was 54.53 inches (1385 mm) long.