yamaha DT 400 (1974-75)

The Yamaha DT 400 was a popular model produced from 1974-75. Its two-stroke engine was a single cylinder with a red valve system, and had a capacity of 397cc. Cooling was achieved by air. The compression ratio was 6.4:1 and it featured a single 28mm Mikuni carburetor and CDI ignition. The maximum power was 23 hp/17.1 kW at 5500 rpm, with max torque of 3.8 kg-m/27.5 lb-ft at 5000 rpm. The transmission was a five-speed with final drive by chain. The front suspension was telescopic forks, while the rear suspension used a swinging arm fork. The front and rear brakes were both drum types. The wheelbase measured 1410mm/55.5 in, and dry weight was 124kg/272lbs. Wet weight was 141kg/310.9lbs with a 9-liter/2.3 US gallon fuel capacity. The top speed was 87mph, and standing quarter mile was 16.5 seconds at 74.5 mph.

Technical specifications:

Make Model: Yamaha DT 400

Year: 1974 – 75
Engine: Two stroke, single cylinder, read valve
Capacity: 397 cc / 24.2 cu-in
Bore x Stroke: 85 70 mm
Cooling System: Air cooled
Compression Ratio: 6.4:1
Induction: Single 28mm Mikuni carburetor
Ignition: CDI
Starting: Kick
Max Power: 23 hp / 17.1 kW @ 5500 rpm
Max Torque: 3.8 kg-m / 27.5 lb-ft @ 5000 rpm
Transmission: 5 Speed
Final Drive: Chain
Front Suspension: Telescopic forks
Rear Suspension: Swinging arm fork
Front Brakes: Drum
Rear Brakes: Drum
Front Tyre: 3.00-21
Rear Tyre: 4.00-18
Wheelbase: 1410 mm / 55.5 in
Dry Weight: 124 kg / 272 lbs
Wet Weight: 141 kg / 310.9 lbs
Fuel Capacity: 9 Litres / 2.3 US gal
Standing 1/4 Mile: 16.5 sec / 74.5 mph
Top Speed: 87 mph