The Yamaha SR400 motorcycle specifications include a 399 cc (24.35 cu in) engine, power of 27 hp (19.7 kW) @ 7,000 rpm, a 5-speed gearbox, and a listed weight of 131 kg (288.8 lb).
Key specifications
The 2011 model is treated as the standard specification. Only later model years with a different supplied value are shown below.
How the Yamaha SR400 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 49% lower than the Yamaha database average. Around the 43rd 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 66th percentile across Yamaha models.
About 8% smaller than the Yamaha database average. Around the 45th percentile across Yamaha models.
Mechanical overview
Additional useful specifications
| Front tire size | 3.50-19 |
|---|---|
| Rear tire size | 4.00-16 |
| Engine oil capacity | 2.40 L (2.54 US qt) |
| Power-to-weight ratio | 0.206 hp/kg |
| Power-to-weight | 206.1 hp/tonne |
| Specific power | 67.7 hp/L |
| Bore/stroke ratio | 1.04:1 (Oversquare) |
Engine specifications
| Engine type | Single cylinder, four-stroke |
|---|---|
| Displacement | 399 cc (24.35 cu in) |
| Power | 27 hp (19.7 kW) @ 7,000 rpm |
| Torque | 62.0 Nm (6.3 kgf-m or 45.7 ft.lbs) @ 6,500 rpm |
| Bore × stroke | 87.0 x 84 mm (3.4 x 3.3 inches) |
| Compression ratio | 8.5:1 |
| Valves per cylinder | 2 |
| Cooling system | Air |
| Fuel system | Carburettor. BSR33 |
| Fuel control | Single Overhead Cams (SOHC) |
| Ignition | CDI |
| Starter | Kick |
| Oil capacity | 2.40 L (2.54 US qt) |
Transmission and drivetrain
| Gearbox | 5-speed |
|---|---|
| Final drive | Chain (final drive) |
Chassis and suspension
| Frame | Half-duplex cradle |
|---|---|
| Front suspension | 35 mm telescoping fork |
| Rear suspension | Dual shocks, 5-way adjustable preload |
| Front wheel travel | 150 mm (5.9 inches) |
| Rear wheel travel | 105 mm (4.1 inches) |
| Rake | 24.7° |
| Trail | 111 mm (4.4 inches) |
Brakes, wheels and tires
| Front brakes | Single disc |
|---|---|
| Rear brakes | Expanding brake (drum brake) |
| Front tire | 3.50-19 |
| Rear tire | 4.00-16 |
Dimensions and weight
| Dry weight | 131 kg (288.8 lb) |
|---|---|
| Seat height | 810 mm (31.9 inches) |
| Overall length | 2,085 mm (82.1 inches) |
| Wheelbase | 1,405 mm (55.3 inches) |
Fuel and emissions
| Fuel capacity | 12.00 L (3.17 US gal) |
|---|
Performance
| Power/weight ratio | 0.2061 hp/kg |
|---|
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.