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Ariel 4G Square Four 1000
1941Allround

Ariel 4G Square Four 1000

Key specifications

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

Overview

### 1941 Ariel 4G Square Four 1000: A Timeless Classic The 1941 Ariel 4G Square Four 1000, affectionately known as the "Squariel," stands as a remarkable testament to British motorcycle engineering during the early 20th century. Designed by the legendary Edward Turner, this motorcycle carved a niche for itself in the all-around category, appealing to both touring enthusiasts and performance riders alike. With its unique square four-cylinder engine configuration and iconic styling, the 4G Square Four not only turned heads on the road but also captured the hearts of many motorcycle aficionados. As World War II loomed, this machine became a symbol of resilience and innovation, representing a time when craftsmanship and performance were paramount. At the heart of the 4G Square Four lies its impressive 997cc square four-cylinder engine, which produces a respectable 35 horsepower at 5,500 RPM. This power allows the motorcycle to reach a top speed of 140 km/h (87 mph), making it a formidable contender in its class. The engine's 6.0:1 compression ratio and dual valves per cylinder contribute to smooth acceleration and responsive handling. Coupled with a 4-speed gearbox and chain final drive, riders can expect a thrilling experience whether on winding country lanes or cruising along open highways. The air-cooled setup ensures that the engine maintains optimal temperatures even during extended rides, making it a reliable partner for long-distance adventures. The 1941 Ariel 4G Square Four is packed with features that enhance both performance and rider comfort. Its tubular single-loop frame provides a sturdy yet lightweight structure, while the telescopic front fork and plunger-link rear suspension work in harmony to absorb bumps and ensure a smooth ride. The motorcycle is equipped with robust drum brakes, measuring 8 inches at the front and 7 inches at the rear, delivering reliable stopping power when needed. Additionally, the 23-liter fuel tank allows for extended journeys without frequent refueling stops, making it an ideal choice for touring enthusiasts. The kick starter adds a vintage charm while providing riders with a direct connection to their machine. ####

Pros

    Cons

    • Unique Engine Design: The square four-cylinder engine offers a distinctive aesthetic and smooth performance, setting it apart from conventional motorcycles of its era.
    • Comfortable Ride: The combination of telescopic front forks and plunger-link rear suspension provides excellent handling and comfort over varied terrain.
    • Generous Fuel Capacity: With a 23-liter tank, riders can enjoy long-distance rides without the constant need for refueling.
    • Weight: At 211 kg (465.2 lbs), the bike may feel cumbersome for some riders, especially during low-speed maneuvers.
    • Braking Performance: While adequate for the time, the drum brakes may not provide the same stopping power and responsiveness as modern disc brakes.
    • Kick Start Only: The absence of an electric starter can be a challenge for those unfamiliar with traditional kick-starting techniques, particularly in cold weather.

    Technical details

    Source specification data

    Make
    Ariel
    Model
    4G Square Four 1000
    Category
    Allround
    Starter
    Kick
    Comments
    Also
    called ´
    Squariel
    ´.
    Designed
    by
    Edward Turner
    .
    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
    Fuel Capacity
    23.00 litres (6.08 gallons)
    Overall Length
    2,083 mm (82.0 inches)
    Weight Incl Oil Gas Etc
    211.0 kg (465.2 pounds)
    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)