Yamaha DT 400 MX 1979 - Specifications & Review

Introducing the 1979 Yamaha DT 400 MX, a quintessential machine in the enduro-offroad category that continues to capture the hearts of motorcycle enthusiasts and collectors alike. Launched in a time when off-road biking was gaining traction, the DT 400 MX stands out as a versatile companion for riders seeking the thrill of adventure on rugged terrains. With its distinctive Yamaha styling and a reputation for durability, this bike was designed to conquer both trails and rough roads with confidence, making it a favorite among both novice and experienced riders.

At the heart of the DT 400 MX lies a robust 397cc single-cylinder, two-stroke engine, delivering a commendable 21 horsepower at 5,600 RPM. This powerplant, combined with a 5-speed gearbox, enables riders to accelerate effortlessly and reach top speeds of around 136 km/h (84.5 mph). The bike's air-cooled design ensures that it runs consistently cool, even during rigorous riding sessions. The compression ratio of 6.4:1, paired with a bore and stroke of 85.0 x 70.0 mm, contributes to its lively throttle response and nimble handling. Riders will appreciate its lightweight frame, tipping the scales at just 141 kg (310.9 pounds) when fully fueled, making it an agile choice for navigating tight trails and challenging off-road conditions.

The Yamaha DT 400 MX is packed with features that enhance the riding experience, including expanding brakes both in the front and rear, which provide reliable stopping power when tackling steep descents or sudden obstacles. The bike is equipped with a 9-liter fuel tank, ensuring that riders can venture further without constantly worrying about refueling. Its design embodies simplicity and functionality, making maintenance straightforward for those who enjoy working on their machines. The DT 400 MX not only boasts impressive performance but also reflects the ethos of Yamaha's commitment to creating reliable and accessible off-road motorcycles.

PROs:

1. Lightweight and Agile: At just 141 kg, the DT 400 MX is easy to handle, making it ideal for both beginners and experienced riders looking for agility on trails.
2. Strong Two-Stroke Engine: The single-cylinder engine provides an exhilarating riding experience, with quick acceleration and sufficient power for various terrains.
3. Simplicity in Maintenance: With a straightforward design and accessible components, this bike is easy to maintain, allowing riders to spend more time on the trails and less in the garage.

CONs:

1. Limited Fuel Capacity: While the 9-liter tank is decent, it may necessitate more frequent stops on longer rides compared to modern bikes with larger tanks.
2. Braking Performance: The expanding brake system, while functional, may not provide the same stopping power or feel as more advanced hydraulic systems found on contemporary models.
3. Vibration Levels: The two-stroke engine can produce noticeable vibrations at higher RPMs, which may affect rider comfort over extended periods of use.

In summary, the 1979 Yamaha DT 400 MX is a classic enduro motorcycle that showcases Yamaha’s dedication to performance and reliability. Whether you are navigating through dense woods or cruising along dirt roads, this bike delivers an engaging riding experience that resonates with the spirit of adventure.