Ariel MK1 Square Four
Key specifications
Overview
### Introducing the 1950 Ariel MK1 Square Four The 1950 Ariel MK1 Square Four is a classic motorcycle that stands as an emblem of innovation and engineering prowess from the post-war era. Positioned in the all-around category, this iconic bike captures the hearts of enthusiasts and collectors alike with its distinctive design and remarkable performance. The MK1 Square Four was not just another motorcycle; it was a testament to Ariel's commitment to pushing the boundaries of motorcycle technology during a time of rapid advancement. With its unique square four engine configuration, this bike offers a blend of power and elegance that continues to resonate with riders today. ### Engine Performance and Riding Characteristics At the heart of the MK1 Square Four lies a robust 997cc single-cylinder, four-stroke engine that delivers an impressive 40 horsepower at 5800 RPM. This power translates into a thrilling ride, characterized by smooth acceleration and responsive handling. The engine’s air-cooling system ensures reliable performance, making it suitable for both leisurely rides and spirited outings. Coupled with a chain final drive, the MK1 Square Four provides a direct and engaging connection to the road, allowing riders to experience the joy of motorcycling in its purest form. The motorcycle's weight of 193 kg (425.5 lbs) strikes an ideal balance, providing stability without sacrificing agility, making it a pleasure to navigate through city streets or winding country roads. ### Key Features and Technology The MK1 Square Four is adorned with several noteworthy features that enhance both performance and comfort. Its tubular single-loop frame not only contributes to the bike's striking aesthetics but also offers durability and rigidity, ensuring a stable ride. The motorcycle is equipped with drum brakes—expanding brake systems that provide reliable stopping power, with a front brake diameter of 178 mm and a rear brake measuring 203 mm. The 23-liter fuel tank allows for extended journeys without frequent refueling stops, a significant advantage for touring enthusiasts. Additionally, the carburettor fuel system is both straightforward and effective, making maintenance a breeze for owners who appreciate hands-on care of their machines. ###
Pros
- Unique Engine Design: The square four configuration provides a distinctive sound and smooth power delivery that sets it apart from standard motorcycle engines.
- Classic Aesthetics: The MK1 Square Four’s vintage design is a showstopper, appealing to those who appreciate the beauty of classic motorcycles.
- Comfortable Touring Capabilities: With a generous fuel capacity and balanced weight distribution, it’s ideal for longer rides without compromising on comfort.
Cons
- Drum Brakes: While reliable, the drum brake system may not offer the stopping power or responsiveness found in modern disc brakes.
- Weight: At 193 kg, some riders may find it heavier compared to contemporary motorcycles, which could affect maneuverability, especially at lower speeds.
- Limited Power: Although 40 HP is respectable for its time, it may feel less potent compared to modern motorcycles, which could deter those seeking high performance.
Technical details
Source specification data
- Make
- Ariel
- Model
- MK1 Square Four
- Category
- Allround
- Power
- 40.00 HP (29.2 kW)) @ 5800 RPM
- Fuel System
- Carburettor
- Displacement
- 997.00 ccm (60.84 cubic inches)
- Cooling System
- Air
- Engine Details
- Single cylinder, four-stroke
- Transmission Type Final Drive
- Chain
- Dry Weight
- 193.0 kg (425.5 pounds)
- Fuel Capacity
- 23.00 litres (6.08 gallons)
- Overall Length
- 2,100 mm (82.7 inches)
- Power Weight Ratio
- 0.2073 HP/kg
- Seat
- Dual
- Wheels
- Spoked
- Rear Tyre
- 4-18
- Frame Type
- Tubular single loop
- Front Tyre
- 3.25-19
- Rear Brakes
- Expanding brake (drum brake)
- Front Brakes
- Expanding brake (drum brake)
- Rear Brakes Diameter
- 203 mm (8.0 inches)
- Front Brakes Diameter
- 178 mm (7.0 inches)