Engineered by Yamaha for the enduro - offroad motorcycle segment, the 1975 Yamaha DT 400 utilizes a 397 cc (24.2 cu in) air-cooled single cylinder, two-stroke layout. In factory specification, peak output is rated at 21 HP (15.3 kW) at 5,600 rpm while maximum torque reaches 37.3 Nm (27.5 lb-ft) at 5,000 rpm, transferring power to the rear wheel through a 5-speed gearbox and chain final drive. With a specific output of 52.9 HP per liter and a 600 rpm working window between peak torque (5,000 rpm) and peak power (5,600 rpm), the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.
On the scales, the DT 400 measures 123.4 kg (272 lbs) dry, translating to a power-to-weight ratio of 0.17 HP/kg (5.88 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,410 mm (55.5 in) wheelbase engineered for quick, flickable steering geometry. The 9-liter (2.4 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 136 km/h (85 mph).
Within MotoLibrary's Yamaha archive, this model family spans 3 indexed model years from 1975 to 1977, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
52.9 HP/L
Power-to-Weight
0.17 HP/kg (5.88 kg/HP)
Power Band Window
5,000–5,600 rpm
Engine
Displacement397.0 ccm (24.22 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power21.0 HP (15.3 kW)) @ 5600 RPM
Torque37.3 Nm (3.8 kgf-m or 27.5 ft.lbs) @ 5000 RPM
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
