NSU 351 OT 1939 - Specifications & Review

Introducing the 1939 NSU 351 OT Motorcycle

The 1939 NSU 351 OT stands as a remarkable testament to the ingenuity and craftsmanship of pre-war motorcycle design. Nestled comfortably in the sport category, this classic machine from NSU reflects an era when motorcycles were not just modes of transportation but expressions of freedom and adventure. With its striking aesthetics and a focus on performance, the 351 OT appeals to both vintage enthusiasts and those who appreciate the historical significance of early German engineering. It’s a bike that invites you to experience the thrill of the open road while paying homage to a rich heritage.

Engine Performance and Riding Characteristics

At the heart of the NSU 351 OT lies a robust single-cylinder, four-stroke engine, boasting a displacement of 331 cc. This powerplant generates a respectable 12.5 HP at 5020 RPM, allowing the motorcycle to reach a top speed of 105 km/h (65.2 mph). The bore and stroke dimensions of 75.0 mm by 75.0 mm result in a perfectly balanced engine, delivering an exhilarating yet manageable riding experience. Riders will appreciate the engaging throttle response from the carburettor-fed engine, which, along with air cooling, ensures reliability even under demanding conditions. The lightweight chassis, tipping the scales at just 150 kg (330.7 lbs), combined with a chain final drive, provides nimble handling and excellent maneuverability, making it an ideal companion for spirited rides through the countryside.

Key Features and Technology

The 351 OT is equipped with a traditional drum brake system, featuring expanding brakes both at the front and rear, allowing for dependable stopping power. The motorcycle's well-proportioned dimensions—2,000 mm in length, 760 mm in width, and 930 mm in height—create a compact and approachable profile, perfect for riders of varying statures. With a fuel capacity of 12.3 litres (3.25 gallons), the NSU 351 OT strikes a fine balance between performance and range, making it suitable for both short jaunts and longer excursions. Its power-to-weight ratio of 0.0833 HP/kg enhances its agility, ensuring that riders can enjoy a spirited ride without sacrificing control.

Pros and Cons

Pros:

1. Classic Design: The 1939 NSU 351 OT features timeless aesthetics that appeal greatly to vintage motorcycle enthusiasts.
2. Lightweight Handling: With a weight of only 150 kg, this motorcycle offers excellent agility and maneuverability, making it fun to ride in various conditions.
3. Decent Performance: The single-cylinder engine provides a spirited ride with respectable power output for its time, allowing for enjoyable cruising speeds.

Cons:

1. Limited Power: With only 12.5 HP, it may not satisfy those seeking modern performance levels and acceleration.
2. Drum Brakes: While adequate for its era, the drum brake system may feel less effective compared to contemporary disc brakes, especially in emergency situations.
3. Fuel Capacity: The 12.3-litre fuel tank might necessitate more frequent stops on longer rides, which could detract from the overall touring experience.

The 1939 NSU 351 OT is not merely a motorcycle but a piece of history that invites riders to explore both the roads and the past, making it a cherished addition to any classic motorcycle collection.