Back to Bike FinderYears: 1936 · 1935 · 1934 · 1933 · 1932
Ariel 4F Square Four 600
1935Allround

Ariel 4F Square Four 600

Key specifications

Engine
601 cc
Power
23 HP
Weight
168 kg
Fuel type
petrol
Fuel capacity
3.5 L
Transmission
4-speed
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

Overview

Introducing the 1935 Ariel 4F Square Four 600—an iconic motorcycle that stands as a testament to the innovative spirit of the 1930s. Designed for the all-rounder, this machine effortlessly combines performance, comfort, and style. Nestled in the heart of the British motorcycle industry, Ariel made its mark by pioneering unique designs, and the Square Four 600 is no exception. Its distinctive square four-cylinder engine and elegant lines make it a sought-after classic among collectors and enthusiasts alike, representing an era when motorcycles were not just vehicles but works of art. At the core of the 4F Square Four is its remarkable square four-cylinder engine, boasting a displacement of 601cc and generating a spirited 23 horsepower at 5600 RPM. This configuration not only provides smooth power delivery but also contributes to the bike's impressive top speed of 140 km/h (87 mph). Riders will appreciate the bike's straightforward 4-speed gearbox and reliable chain final drive, allowing for a seamless transition between gears. With a compression ratio of 6.9:1, the engine delivers a thrilling ride while retaining the charm of its vintage origins. The combination of air cooling and a carburettor fuel system ensures a straightforward maintenance experience, making this model a favorite among enthusiasts who love the classic feel of a well-engineered motorcycle. The 1935 Ariel 4F Square Four 600 is not just about performance; it’s also about the technology and features that make riding enjoyable. The tubular single-loop frame contributes to the bike's stability and handling, while the spring girder front suspension provides a comfortable ride over varied terrains. Both the front and rear drum brakes offer reliable stopping power, instilling confidence in riders navigating the open road. With a fuel capacity of 13.25 liters, this motorcycle is designed for longer journeys, allowing riders to experience the freedom of the open road without frequent stops. The kick starter adds to its vintage charm, connecting riders to the tactile experience of starting a real classic. **

Pros

  • Unique square four-cylinder engine design enhances smoothness and performance.
  • Classic aesthetics combined with practical features make it a standout on the road.
  • Comfortable riding experience thanks to the spring girder front suspension.

Cons

  • Limited top speed may not satisfy riders looking for high-performance capabilities.
  • Drum brakes, while nostalgic, may lack the stopping power of modern disc brakes.
  • The rigid rear suspension can lead to a less cushioned ride on rough surfaces.

Technical details

Source specification data

Make
Ariel
Model
4F Square Four 600
Category
Allround
Starter
Kick
Power
23.00 HP (16.8 kW)) @ 5600 RPM
Gearbox
4-speed
Top Speed
140.0 km/h (87.0 mph)
Driveline
Burman gearbox
Engine Type
Double twin - square 4 cylinder arrangement
Fuel System
Carburettor
Bore X Stroke
56.0 x 61.0 mm (2.2 x 2.4 inches)
Compression
6.9:1
Displacement
601.00 ccm (36.67 cubic inches)
Cooling System
Air
Engine Details
Square four cylinder
Exhaust System
2 x 1-into-1 pipes
Valves Per Cylinder
2
Transmission Type Final Drive
Chain
Dry Weight
168.0 kg (370.4 pounds)
Fuel Capacity
13.25 litres (3.50 gallons)
Power Weight Ratio
0.1369 HP/kg
Wheels
Wire spoked
Rear Tyre
3.25-19
Frame Type
Tubular single loop
Front Tyre
3.25-19
Rear Brakes
Expanding brake (drum brake)
Front Brakes
Expanding brake (drum brake)
Rear Suspension
Rigid
Front Suspension
Spring girders