Yamaha RD400

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Yamaha RD400 DX 1978.jpg
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.

See also[edit]


  1. ^ a b c d e f "Bike". Bauer. May 1979. p. 71. 
  2. ^ Dain Gingerelli (January 1993). "RD Days". Cycle World: 86. Retrieved 2015-06-17. 

External links[edit]