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Ariel 4G Square Four 1000
1945Allround

Ariel 4G Square Four 1000

Key specifications

Engine
995 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

Introducing the 1945 Ariel 4G Square Four 1000, a remarkable motorcycle that stands as a testament to the innovation and engineering prowess of its era. Often affectionately referred to as the "Squariel," this classic machine was designed by the legendary Edward Turner, who infused it with character and performance that appealed to a diverse range of riders. Positioned as an allrounder, the 4G Square Four was aimed at enthusiasts seeking both comfort and capability, whether on city streets or winding country roads. Its unique square four-cylinder engine design set it apart from the competition, making it a distinctive choice for those who appreciate the artistry of motorcycle engineering. At the heart of the 4G Square Four is its impressive 995cc square four engine, delivering 35 horsepower at 5,500 RPM. This powerhouse combines an innovative engine configuration with a respectable compression ratio of 6.0:1, allowing for a top speed of 140 km/h (87 mph). The air-cooled engine utilizes a carburettor system, specifically the SU MC2, which ensures smooth throttle response and power delivery. Riders will appreciate the 4-speed gearbox that provides seamless shifting, allowing for an engaging ride whether cruising at a leisurely pace or tackling challenging terrain. With a weight of 211 kg (465.2 lbs), the 4G Square Four strikes an excellent balance between stability and agility, making it a joy to ride. The 1945 Ariel 4G Square Four is not just about raw power; it also boasts a host of features that enhance the riding experience. The tubular single-loop frame provides strength and rigidity, while the front telescopic forks and plunger-link rear suspension ensure a comfortable ride even on rough surfaces. Drum brakes, with an 8-inch diameter in the front and 7 inches in the rear, offer reliable stopping power, which is essential for safety and control. Fuel capacity is a generous 23 liters (6.08 gallons), allowing for long-distance rides without frequent stops. Available in striking red and silver, this motorcycle is not only a mechanical marvel but also a visual delight that turns heads wherever it goes. In summary, the Ariel 4G Square Four 1000 is a timeless classic that embodies the spirit of post-war motorcycle innovation. Its combination of engineering excellence, unique design, and riding comfort makes it a standout choice for both collectors and riders who appreciate the rich history of motorcycling.

Pros

  • Unique Engine Design: The square four-cylinder engine offers a distinctive aesthetic and performance, setting it apart in the classic motorcycle market.
  • Comfortable Ride: With a well-engineered suspension system and ample fuel capacity, the 4G Square Four is suitable for longer journeys and diverse road conditions.
  • Classic Aesthetic: The combination of its vintage styling and elegant color options makes it a desirable collector's item for enthusiasts.

Cons

  • Weight: At 211 kg, some riders may find the 4G Square Four on the heavier side, which could affect maneuverability at lower speeds.
  • Drum Brakes: While effective for their time, drum brakes may not provide the same level of stopping power as modern disc brakes, potentially limiting performance in emergency situations.
  • Kick Start Only: The reliance on a kick starter may be a drawback for those accustomed to the convenience of electric start systems found in contemporary motorcycles.

Technical details

Source specification data

Make
Ariel
Model
4G Square Four 1000
Category
Allround
Starter
Kick
Comments
Also
called ´
Squariel
´.
Designed
by
Edward Turner
.
Color Options
Red/silver
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
995.00 ccm (60.71 cubic inches)
Cooling System
Air
Engine Details
Square four cylinder
Exhaust System
Dual two-into-one
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)
Seat
Solo seat with springs
Wheels
Wire spoked. Red and silver rims.
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/silver