NSU 351 OSL 1935 - Specifications & Review

Introducing the 1935 NSU 351 OSL: A Classic Sportster on Two Wheels

In the mid-1930s, the motorcycle industry was brimming with innovation, and the NSU 351 OSL emerged as a notable contender in the sport category. Renowned for its remarkable blend of performance, style, and engineering, the 351 OSL quickly captured the hearts of motorcycle enthusiasts and sport riders alike. With its distinctive open double steel frame and a classic aesthetic that harks back to the golden age of motorcycling, this bike isn't just a mode of transport; it's a piece of history that continues to inspire admiration.

Engine Performance and Riding Characteristics

At the core of the NSU 351 OSL is its robust single-cylinder, four-stroke engine, boasting a displacement of 346 cc. Generating an impressive 18 HP at 5020 RPM, the 351 OSL delivers spirited acceleration that propels the rider to a top speed of 110 km/h (68.4 mph). The combination of a 4-speed gearbox and chain final drive offers a smooth and responsive riding experience, making it ideal for both spirited outings and leisurely cruises. The air-cooled engine, paired with a Graetzin KE 25/43 carburettor, ensures a reliable performance even in varied conditions, embodying the spirit of adventure that every rider seeks.

Key Features and Technology

The 1935 NSU 351 OSL is not just about raw power; it’s also equipped with features that enhance its usability and comfort. The open double steel frame not only contributes to its lightweight design of 110 kg (242.5 lbs) but also provides excellent handling characteristics, making it a joy to maneuver. The expanding drum brakes, both front and rear, offer reliable stopping power, ensuring that riders can confidently navigate both urban streets and winding country roads. With a length of 2020 mm (79.5 inches) and a height of 940 mm (37.0 inches), the bike strikes a balanced silhouette that is both approachable and commanding on the road. Add in the classic kick starter for that authentic touch, and you have a machine that embodies the essence of the era.

Pros and Cons of the NSU 351 OSL

Pros:

1. Classic Aesthetic: The timeless design and build quality of the 351 OSL make it a standout in any collection, appealing to vintage motorcycle enthusiasts.
2. Lightweight and Nimble: Weighing in at just 110 kg, the bike offers excellent maneuverability and handling, perfect for both new and experienced riders.
3. Solid Performance: With a respectable top speed of 110 km/h and a reliable power delivery, this motorcycle is well-suited for spirited rides and daily commutes.

Cons:

1. Limited Power Output: While 18 HP is sufficient for casual riding, it may feel underwhelming for those seeking high-speed thrills or aggressive performance.
2. Drum Brakes: The expanding drum brakes, while reliable for their time, may not provide the stopping power and responsiveness expected by modern riders.
3. Kick Starter Only: The absence of an electric starter may deter some riders who prefer the convenience of modern starting mechanisms, especially in cold weather.

The 1935 NSU 351 OSL is more than just a motorcycle; it’s a celebration of an era when two wheels represented freedom and adventure. Whether you’re a collector, an enthusiast, or someone who appreciates the craftsmanship of yesteryear, the NSU 351 OSL is a compelling choice that continues to evoke nostalgia and excitement.