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Ariel 4G Square Four 1000
1937Allround

Ariel 4G Square Four 1000

Key specifications

Engine
997 cc
Power
35 HP
Weight
193 kg
Fuel type
petrol
Fuel capacity
6.1 L
Transmission
4-speed
Front brakes
Expanding brake (drum brake)
Rear brakes
Expanding brake (drum brake)

Overview

Introducing the 1937 Ariel 4G Square Four 1000, a stunning piece of engineering that stands as a testament to the golden age of British motorcycling. Ariel, a name synonymous with innovation and quality, pushed the boundaries of performance with this all-rounder motorcycle, which perfectly balances power, style, and comfort. The 4G Square Four was designed for those who sought both adventure and elegance, making it a coveted choice among enthusiasts and collectors alike. With its striking red and white color options, this bike not only turns heads but also delivers a uniquely exhilarating riding experience that captures the spirit of the time. At the heart of the 4G Square Four is a square four-cylinder engine that boasts a displacement of 997 cc, producing an impressive 35 HP at 5500 RPM. This power translates to a top speed of 140 km/h (87 mph), allowing riders to glide effortlessly along the open roads. The engine's 6.0:1 compression ratio, combined with its SU MC2 carburettor, ensures a responsive throttle and smooth acceleration, making every ride a thrilling experience. The motorcycle's 4-speed gearbox and chain final drive provide seamless gear shifts, making it equally adept at navigating city streets or cruising on the highway. Riders will appreciate the bike's weight of 193 kg (425.5 lbs), which offers a sturdy yet agile handling characteristic that inspires confidence in all riding conditions. The 1937 Ariel 4G Square Four is not just about brute force; it also features advanced technology for its time. The tubular single-loop frame ensures a robust structure, while the telescopic front fork and plunger-link rear suspension provide a comfortable ride, absorbing bumps with grace. The bike is equipped with drum brakes, featuring an 8-inch front brake and a 7-inch rear brake, delivering adequate stopping power for spirited riding. With a fuel capacity of 23 liters (6.08 gallons), the 4G Square Four is designed for longer journeys, allowing riders to embrace the open road without frequent stops. Kick-starting the engine adds a nostalgic touch, connecting riders with the traditional motorcycling experience. **

Pros

  • Unique Engine Design: The square four-cylinder engine offers a distinctive performance and character, setting it apart from conventional motorcycles.
  • Comfortable Ride: The telescopic front fork and plunger-link rear suspension combine to provide a smooth riding experience, even on uneven surfaces.
  • Striking Aesthetics: With its classic red and white color scheme, the 4G Square Four is a visual delight that stands out in any collection.

Cons

  • Weight: At 193 kg, the motorcycle may feel heavy for some riders, especially at low speeds or when maneuvering in tight spaces.
  • Drum Brakes: While adequate for the era, the drum brakes may not provide the same level of stopping power and responsiveness as modern disc brakes.
  • Kick Start: The traditional kick-start mechanism can be less convenient compared to electric starters, particularly for novice riders or those in a hurry.

Technical details

Source specification data

Make
Ariel
Model
4G Square Four 1000
Category
Allround
Starter
Kick
Color Options
Red/white
Power
35.00 HP (25.5 kW)) @ 5500 RPM
Gearbox
4-speed
Top Speed
140.0 km/h (87.0 mph)
Engine Type
Double twin cylinder arranged as a square
Fuel System
Carburettor. SU MC2 carburettor
Bore X Stroke
65.0 x 78.0 mm (2.6 x 3.1 inches)
Compression
6.0:1
Displacement
997.00 ccm (60.84 cubic inches)
Cooling System
Air
Engine Details
Square four cylinder
Valves Per Cylinder
2
Transmission Type Final Drive
Chain
Dry Weight
193.0 kg (425.5 pounds)
Fuel Capacity
23.00 litres (6.08 gallons)
Overall Length
2,083 mm (82.0 inches)
Power Weight Ratio
0.1813 HP/kg
Wheels
Wire spoked
Rear Tyre
4.00-18
Frame Type
Tubular single loop
Front Tyre
3.25-19
Rear Brakes
Expanding brake (drum brake)
Front Brakes
Expanding brake (drum brake)
Rear Suspension
Plunger-link spring
Front Suspension
Telescopic fork
Rear Brakes Diameter
178 mm (7.0 inches)
Front Brakes Diameter
203 mm (8.0 inches)

Available colors

Red/white