Yamaha RD400F (1978-79)

The Yamaha RD400F (1978-79) is a two-stroke motorcycle with a parallel twin-cylinder engine that has a capacity of 398cc. It features air cooling with a compression ratio of 6.2:1 and uses Autolube lubrication with reed-valve torque induction. Its ignition is a CDI and starting is via kick. It can produce a maximum power of 44 hp / 32.3 kW @ 7500 rpm and max torque of 41.1 Nm / 4.2 kgf-m @ 7000 rpm. The clutch is wet multiplate with six-speed transmission and chain final drive. The front suspension is a telescopic fork, while the rear suspension has a swing arm with dual shocks. The front and rear brakes have single 267mm discs, with front and rear tires of 3.00S-18 and 3.50S-18, respectively. The dimensions of the bike are length 1995 mm / 78.5 in, width 760 mm / 3.0 in, and height 1060 mm / 41.7 in. It has a wheelbase of 1320 mm / 51.9 in, seat height of 800 mm / 31.4 in, ground clearance of 150 mm / 5.9 in, dry weight of 165.5 kg / 364.8 lbs, and a fuel capacity of 16.5 Litres / 4.3 US gal. Its average consumption is 43 mpg, with a standing 1/4 mile of 14.1 sec / 90.1 mph 145 km/h and a top speed of 106.8 mph 172 km/h.

Technical specifications:

Make Model: Yamaha RD 400

Year: 1978 – 79
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: CDI
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