The Yamaha RD 400 C motorcycle specifications include a 399 cc (24.35 cu in) engine, power of 43 hp (31.4 kW) @ 7,100 rpm, a 6-speed gearbox, and a listed weight of 177 kg (390.2 lb).
Key specifications
The 1976 model is treated as the standard specification. Only later model years with a different supplied value are shown below.
How the Yamaha RD 400 C compares
This compares the motorcycle with all Yamaha models in this specifications database. The blue marker is this model and the grey line is the Yamaha database average.
About 19% lower than the Yamaha database average. Around the 50th percentile across Yamaha models.
About 27% lower than the Yamaha database average. Around the 48th percentile across Yamaha models.
Very close to the Yamaha database average. Around the 48th percentile across Yamaha models.
About 27% larger than the Yamaha database average. Around the 67th percentile across Yamaha models.
Yamaha database percentile rankings
Percentiles show where this motorcycle sits across the Yamaha specifications database. They are descriptive database rankings, not performance ratings.
43 hp — more powerful than about 50% of Yamaha models with power data.
399 cc — larger displacement than about 48% of Yamaha models.
177 kg — heavier than about 48% of Yamaha models, or lighter than about 52%.
16.5 L — larger than about 67% of Yamaha fuel tanks in this database.
Mechanical overview
Additional useful specifications
| Front tire size | 3.00-18 |
|---|---|
| Rear tire size | 3.50-18 |
| Power-to-weight ratio | 0.243 hp/kg |
| Power-to-weight | 242.9 hp/tonne |
| Specific power | 107.8 hp/L |
| Bore/stroke ratio | 1.03:1 (Oversquare) |
Model information
| Category | Sport |
|---|
Engine specifications
| Engine type | Twin, two-stroke |
|---|---|
| Displacement | 399 cc (24.35 cu in) |
| Power | 43 hp (31.4 kW) @ 7,100 rpm |
| Bore × stroke | 64.0 x 62 mm (2.5 x 2.4 inches) |
| Compression ratio | 6.2:1 |
| Cooling system | Air |
| Fuel control | Membrane |
Transmission and drivetrain
| Gearbox | 6-speed |
|---|---|
| Final drive | Chain (final drive) |
Brakes, wheels and tires
| Front brakes | Single disc |
|---|---|
| Rear brakes | Single disc |
| Front tire | 3.00-18 |
| Rear tire | 3.50-18 |
Dimensions and weight
| Wet weight | 177 kg (390.2 lb) |
|---|
Fuel and emissions
| Fuel capacity | 16.50 L (4.36 US gal) |
|---|
Performance
| Top speed | 141.0 km/h (87.6 mph) |
|---|
Disclaimer: Specifications may vary by market, trim, production date and optional equipment, and scraped or historical data can contain errors. Comparison and percentile values are calculated from Yamaha models in this specifications database. Always double-check important specifications against the motorcycle owner’s/service manual and official Yamaha information before relying on them. Visit the official Yamaha website.