| MODEL | YAMAHA RD 400C 1976 |
| Year | 1976 |
| Engine Type | Two-stroke, parallel twin, reed-valve torque induction |
| Displacement / Capacity | 398 cc / 24.2 cu in |
| Bore X Stroke | 64 x 62 mm |
| Compression Ratio | 6.2:1 |
| Cooling System | Air cooled |
| Max Power | 32.3 kW / 44 hp @ 7500 rpm |
| Max Torque | 41.1 Nm / 4.2 kgf-m @ 7000 rpm |
| Ignition | Battery, dual coils, breaker points |
| Induction | 2 x 28 mm Mikuni carburettors |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | Autolube |
| Gear Box | 6-speed |
| Clutch | Wet multiplate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic forks |
| Rear Suspension | Swingarm, dual shocks |
| Front Brakes | Single 267 mm disc |
| Rear Brakes | Single 267 mm disc |
| DIMENSION SPECS | |
| Overall Length | 1995 mm / 78.5 in |
| Overall Width | 760 mm / 29.9 in |
| Overall Height | 1060 mm / 41.7 in |
| Seat Height | 800 mm / 31.4 in |
| Wheelbase | 1320 mm / 51.9 in |
| Ground Clearance | 150 mm / 5.9 in |
| Dry Weight | 165.5 kg / 364.8 lb |
| Wet Weight | 171 kg / 376 lb |
| WHEEL SPECS | |
| Front Tyre | 3.00S-18 |
| Rear Tyre | 3.50S-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 16.5 Litres / 4.3 US gal |
| Fuel Consumption | 43 mpg |
| Top Speed | 172 km/h / 106.8 mph |
The RD400C of 1976 grew out of the RD350 with a 398 cc air-cooled reed-valve twin. Wikipedia notes it came with spoked wheels and a rear drum, with cast wheels and a rear disc as an option, and it was described as the first bike from a major maker to be fitted with cast wheels. Points-and-coil ignition was used.
