Ariel 4F Square Four (1932-36)

The Ariel 4F Square Four 600 was produced from 1932 to 1936 and there were 2647 units made. It had a four stroke parallel twin engine with an overhead cam and a capacity of 601cc. The cooling system was air cooled with a compression ratio of 6.9:1. There were two 1-into-1 exhausts and a carburetor induction with a kick start for starting. In 1939, the motorcycle had a maximum power of 17 kW / 23 hp at 5600 rpm. The transmission was a four-speed Burman with final drive being a chain. The frame was made with brazed-lug tubular semi-cradle construction and duplex down-tube. The front suspension was Ariel centre spring girders while the rear suspension was rigid and a spring loaded saddle. The front and rear brakes were drum and measured 7 inches. The wheels were steel and had laced wire spokes with a front rim of 3.25 x 19 and a rear rim of 3.25 x 19. The wheelbase was 1384mm / 54.5 in and the dry weight was 168 kg / 370 lbs.

---

Technical specifications:

Make Model: Ariel 4F Square Four 600

Year: 1932 – 36

Production: 2647 units

Engine: Four stroke, parallel twin, OHC

Capacity: 601 cc / 36.7 cu in

Bore x Stroke: 56 x 61 mm

Cooling System: Air cooled

Compression Ratio: 6.9:1

Exhaust: 2 x 1-into-1

Induction: Carburetor

Starting: Kick start

Max Power: 17 kW / 23 hp @ 5600 rpm (1939 model)

Transmission: 4-Speed, Burman

Final Drive: Chain

Frame: Brazed-lug tubular semi-cradle construction, duplex down-tube

Front Suspension: Ariel centre spring girders

Rear Suspension: Rigid, spring loaded saddle

Front Brakes: Drum, 7 in

Rear Brakes: Drum, 7 in

Wheels: Steel, laced wire spokes

Front Rim: 3.25 x 19

Rear Rim: 3.25 x 19

Wheelbase: 1384mm / 54.5 in

Dry Weight: 168 kg / 370 lbs