Yamaha RD400
 1978 Yamaha 400 DX | |
| Manufacturer | Yamaha Motor Company |
|---|---|
| Production | 1975–1980 |
| Predecessor | Yamaha RD350 |
| Successor |
Yamaha RD350LC Yamaha RZ350 |
| Class | Standard |
| Engine | 399 cc (24.3 cu in), air-cooled, Two-stroke, straight twin |
| Bore / stroke | 64 mm × 62 mm (2.5 in × 2.4 in) |
| Compression ratio | 6.2:1 |
| Top speed | 106.8 mph (171.9 km/h)[1] |
| Power | 44 bhp (33 kW) @ 7,000 rpm[1] |
| Torque | 30.3 lb⋅ft (41.1 N⋅m) @ 6,500 rpm[1] |
| Ignition type | Kick start: points (CDI ignition from 1978) |
| Transmission | 6-speed manual, chain final drive |
| Frame type | Tubular twin cradle |
| Suspension | Front telescopic forks; rear swingarm with twin rear shock absorbers |
| Brakes | Single disc brake, front and rear |
| Rake, trail | 27.5°, 110 mm (4.3 in) |
| Wheelbase | 1,330 mm (52.5 in) |
| Dimensions |
W: 800 mm (31.5 in) |
| Seat height | 800 mm (31.5 in) |
| Weight | 165 kg (364 lb) (with 4.5 l; 1.2 US gal (1 imp gal) of fuel)[1] (wet) |
| Fuel capacity | 16.5 l (3.6 imp gal; 4.4 US gal) |
| Oil capacity | 1.6 litres (1.7 US qt) |
| Fuel consumption | 30 to 42 mpg‑imp (9.4 to 6.7 L/100 km; 25 to 35 mpg‑US)[1] |
The RD400 is a 399 cc (24.3 cu in) two-stroke air cooled six-speed motorcycle produced by Yamaha from 1975 until 1980. It evolved directly from the Yamaha RD350 The 350 evolved into the RD400C in 1975, the "D" and "E" in '77–'78 and the final model, the white 1980 RD400G. (The model year for the first RD400, which was sold in the U.S. in the summer of 1975, was 1976.)
The brakes were single disc front and rear. It could complete a standing quarter-mile in 14.01 seconds.[1]
The RD400C was the first motorcycle by a major manufacturer to be fitted with cast wheels.[2]
In 1979 the RD was fitted with a capacitor discharge electronic ignition (CDI) unit as well as having thinner spoked cast wheels, a new foot peg position and some minor engine modifications.