Open main menu

Yamaha RD400

The Yamaha RD400 was a twin, two-stroke Classic motorcycle produced by Yamaha between 1976 and 1979. It could reach a top speed of 109 mph (175 km/h). Claimed horsepower was 42.11 HP (31.4 KW) @ 7500 RPM.

Yamaha RD400
Also called RD400C, RD 400 C, RD 400
Production 1976 - 1979
Class Classic
twin, two-stroke
Bore / Stroke 64.0mm x 62.0mm
Compression ratio 6.2:1
Top Speed 109 mph (175 km/h)
Horsepower 42.11 HP (31.4 KW) @ 7500RPM
Spark Plug NGK B8ES '76-79
Battery YUASA 12N5-5A-3B '76-79
Transmission Gear box: 6-speed

Final Drive: chain

Clutch: Wet multi-plate
Final Drive Chain: 530x96
Front Sprocket 16T
Rear Sprocket 37T
Suspension Front: Telescopic Forks
Rear: Swingarm
Brakes Front: single disc
Rear: single disc
Front Tire 3.00-18
Rear Tire 3.50-18
Wheelbase 52.01 inches (1321 mm)
Length 78.5 inches (1994 mm)
Width 29.88 inches (759 mm)
Seat Height 31.5 inches (800 mm)
Weight 175.0 kg (wet)
Fuel Capacity 4.36 Gallon (16.50 Liters)
Related Yamaha RD250LC, Yamaha RD200, Yamaha RD250, Yamaha RD350, Yamaha RD400
Manuals Service Manual

Brochures · Reviews · Ads ·



The engine was a air cooled twin, two-stroke. A 64.0mm bore x 62.0mm stroke result in a displacement of just 399.0 cubic centimeters. Fuel was supplied via a membrane.


The bike has a 6-speed transmission. Power was moderated via the Wet multi-plate.


It came with a 3.00-18 front tire and a 3.50-18 rear tire. Stopping was achieved via single disc in the front and a single disc in the rear. The front suspension was a Telescopic Forks while the rear was equipped with a Swingarm. The RD400 was fitted with a 4.36 Gallon (16.50 Liters) fuel tank. The wheelbase was 52.01 inches (1321 mm) long.

1976 RD400-CEdit

1977 RD400Edit

1978 RD400Edit


  • Last year exported to US.

1976 - 1980 Yamaha RD 400Edit

The Yamaha RD 400 has already become a classic in its own time. Fully equipped with speedometer, tachometer, hydraulically operated disc brakes on front and rear.

In MediaEdit

See AlsoEdit

External LinksEdit