The Yamaha RD 400 motorcycle specifications include a 399 cc (24.35 cu in) engine, a 6-speed gearbox, and a listed weight of 175 kg (385.8 lb).
Key specifications
Year-specific specification changes
How the Yamaha RD 400 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 27% lower than the Yamaha database average. Around the 48th percentile across Yamaha models.
About 6% lighter than the Yamaha database average. Around the 47th 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.
399 cc — larger displacement than about 48% of Yamaha models.
175 kg — heavier than about 47% of Yamaha models, or lighter than about 53%.
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 |
| Bore/stroke ratio | 1.03:1 (Oversquare) |
Model information
| Category | Classic |
|---|
Engine specifications
| Engine type | Twin, two-stroke |
|---|---|
| Displacement | 399 cc (24.35 cu in) |
| Bore × stroke | 64.0 x 62 mm (2.5 x 2.4 inches) |
| Compression ratio | 6.0:1 |
| 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 | 175 kg (385.8 lb) |
|---|
Fuel and emissions
| Fuel capacity | 16.50 L (4.36 US gal) |
|---|
Performance
| Top speed | 175.0 km/h (108.7 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.