The Yamaha XS 400 motorcycle specifications include a 392 cc (23.92 cu in) engine, a 6-speed gearbox, and a listed weight of 182 kg (401.2 lb).
Key specifications
The 1978 model is treated as the standard specification. Only later model years with a different supplied value are shown below.
How the Yamaha XS 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 29% lower than the Yamaha database average. Around the 45th percentile across Yamaha models.
Very close to the Yamaha database average. Around the 51st percentile across Yamaha models.
About 30% larger than the Yamaha database average. Around the 73rd 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.
392 cc — larger displacement than about 45% of Yamaha models.
182 kg — heavier than about 51% of Yamaha models, or lighter than about 49%.
17 L — larger than about 73% of Yamaha fuel tanks in this database.
Mechanical overview
Additional useful specifications
| Front tire size | 3.00-18 |
|---|---|
| Rear tire size | 3.75-18 |
| Bore/stroke ratio | 1.32:1 (Oversquare) |
Model information
| Category | Naked bike |
|---|
Engine specifications
| Engine type | Twin, four-stroke |
|---|---|
| Displacement | 392 cc (23.92 cu in) |
| Bore × stroke | 69.0 x 52.4 mm (2.7 x 2.1 inches) |
| Compression ratio | 9.2:1 |
| Valves per cylinder | 2 |
| Cooling system | Air |
| Fuel control | Overhead Cams (OHC) |
Transmission and drivetrain
| Gearbox | 6-speed |
|---|---|
| Final drive | Chain (final drive) |
Brakes, wheels and tires
| Front brakes | Single disc |
|---|---|
| Rear brakes | Expanding brake |
| Front tire | 3.00-18 |
| Rear tire | 3.75-18 |
Dimensions and weight
| Wet weight | 182 kg (401.2 lb) |
|---|
Fuel and emissions
| Fuel capacity | 17.00 L (4.49 US gal) |
|---|
Performance
| Top speed | 140.0 km/h (87.0 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.