Simplex Automatic 1945 - Specifications & Review

Introducing the 1945 Simplex Automatic Motorcycle

The 1945 Simplex Automatic motorcycle stands as a distinctive piece of American motorcycling history, bridging the gap between the war years and the burgeoning motorcycle culture of the post-war era. Targeted towards those seeking reliability and simplicity, it was a popular choice for both novice riders and those looking for a no-frills commuting option. With its lightweight frame and user-friendly design, the Simplex Automatic captured the essence of practicality, making it an all-around contender in the motorcycle market of its time.

Engine Performance and Riding Characteristics

At the heart of the Simplex Automatic lies a robust 130cc single-cylinder, two-stroke engine, delivering a modest but spirited 4 horsepower at 4,000 RPM. This powertrain is characterized by a compression ratio of 6.5:1, ensuring efficient combustion and smooth acceleration. Riders will appreciate the simplicity of the carburettor system, specifically the Tillotson, which offers ease of maintenance and tuning. The bike’s lightweight design, at just 61.2 kg (135 pounds), contributes to its agile handling, making it an ideal choice for urban commuting or leisurely rides. The belt final drive eliminates the hassle of chains, providing a smoother and quieter ride, while the rigid rear suspension adds to its straightforward, reliable performance.

Key Features and Technology

The Simplex Automatic showcases innovative design elements that were ahead of its time. Its duplex loop frame provides both strength and stability, ensuring that the motorcycle remains steady even at higher speeds. The front suspension employs short rocker arms with two coil springs, offering a level of comfort that complements its minimalist aesthetic. Riders will also appreciate the dual spark plug ignition system, which enhances efficiency and reliability. Fueling up is a breeze with a generous 9.46-liter (2.5 gallons) tank, allowing for longer rides without frequent stops. These thoughtful features make the Simplex Automatic not just a motorcycle but a symbol of the era's ingenuity.

Pros and Cons

Pros:

1. Lightweight and agile: Weighing only 61.2 kg, the Simplex Automatic is easy to maneuver, making it great for beginners and city riding.
2. Simple maintenance: The two-stroke engine and belt drive system simplify upkeep, appealing to riders who prefer hassle-free ownership.
3. Classic aesthetic: Its vintage design and unique features offer a nostalgic charm that attracts collectors and enthusiasts alike.

Cons:

1. Limited power output: With only 4 HP, it may struggle on steeper hills or against stronger highway traffic.
2. Rigid rear suspension: The absence of rear suspension can lead to a less comfortable ride on uneven surfaces.
3. Two-stroke engine noise: While some appreciate the characteristic sound, others may find the noise level off-putting compared to modern motorcycles.

In summary, the 1945 Simplex Automatic is a delightful blend of practicality and nostalgia, making it a cherished choice for motorcycle enthusiasts who appreciate the raw simplicity and charm of mid-20th century engineering.