Yamaha RD400C (1976-77)

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The Yamaha RD400C (1976-77) is a two-stroke, parallel twin-cylinder motorcycle with a capacity of 398cc. It features reed-valve torque induction, air cooling, and a compression ratio of 6.2:1. The engine is lubricated by Autolube, and the bike has a 6-speed transmission with a wet multiplate clutch.

The Yamaha RD400C has a maximum power of 44hp at 7500 rpm and a maximum torque of 41.1 Nm at 7000 rpm. It has a single 267mm disc for both front and rear brakes, and the front suspension is telescopic while the rear is a swing arm with dual shocks. The bike has a wheelbase of 1320mm, a seat height of 800mm, and a dry weight of 165.5kg.

The RD400C has a fuel capacity of 16.5 liters and has an average consumption of 43mpg. Its standing 1/4 mile is 14.1 sec at 90.1 mph, and its top speed is 106.8 mph at 172 km/h. Overall, the Yamaha RD400C is a powerful and well-designed bike that offers comfort and speed.

Technical specifications:

Make Model: Yamaha RD 400

Year: 1976 – 77


Engine: Two stroke, parallel twin cylinder, reed-valve torque induction
Capacity: 398 cc / 24.2 cu-in
Bore x Stroke: 64 62 mm
Cooling System: Air cooled
Compression Ratio: 6.2:1
Lubrication: Autolube
Induction: 2x 28mm Mikuni carburetors
Ignition: Battery, dual coils, breaker points
Starting: Kick
Max Power: 44 hp / 32.3 kW @ 7500 rpm
Max Torque: 41.1 Nm / 4.2 kgf-m @ 7000 rpm
Clutch: Wet multiplate
Transmission: 6 Speed
Final Drive: Chain
Front Suspension: Telescopic forks

Rear Suspension: Swing arm, dual shocks
Front Brakes: Single 267mm disc
Rear Brakes: Single 267mm disc
Front Tyre: 3.00S-18
Rear Tyre: 3.50S-18
Dimensions: Length 1995 mm / 78.5 in Width 760 mm / 3.0 in Height 1060 mm / 41.7 in
Wheelbase: 1320 mm / 51.9 in
Seat Height: 800 mm / 31.4 in
Ground Clearance: 150 mm / 5.9 in
Dry Weight: 165.5 kg / 364.8 lbs
Wet Weight: 171 kg / 376 lbs
Fuel Capacity: 16.5 Litres / 4.3 US gal
Consumption Average: 43 mpg
Standing 1/4 Mile: 14.1 sec / 90.1 mph 145 km/h
Top Speed: 106.8 mph 172 km/h

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