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 |
