Yamaha XT 400 (1981-85) vs Yamaha SR 400 (1998-03) vs Yamaha RD 125 (1977)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Yamaha |
| Model: | XT 400 | SR 400 | RD 125 |
| Years: | 1981-85 | 1998-03 | 1977 |
| Engine: | Four stroke, single cylinder, SOHC, 4 valve | Four stroke, single cylinder, SOHC, 2 valves per cylinder. | Two stroke, parallel twin |
| Capacity: | 399 cc / 24.3 cu-in | 399 cc / 24.3 cu-in | 124 cc / 7.6 cu-in |
| Bore x Stroke: | 87 х 67.2 mm | 87 х 67.2 mm | 43 х 43 mm |
| Cooling System: | Air cooled | Air cooled | Air cooled |
| Compression Ratio: | 8.8:1 | 8.5:1 | 6.8:1 |
| Induction: | Caburetor | BSR33 carburetor | 2x 18mm Teikei carburetors |
| Ignition: | CDI | CDI | Battery coil |
| Starting: | Kick | Kick | Kick |
| Max Power: | 31 hp / 22 Kw @ 7000 rpm | 27 hp / 17.1 KW @ 7000 rpm | 17 hp / 12.4 kW @ 8500 rpm |
| Max Torque: | 3.2-kg-m / 31.0 Nm @6000 rpm | 27.4 Nm / 6.3 kgf-m @ 6500 rpm | 1.3 kgf-m @ 8000 rpm |
| Transmission: | 5 Speed | 5 Speed | 5 Speed |
| Final Drive: | Chain | Chain | Chain |
| Front Suspension: | Telescopic forks | Telescopic fork | 28 mm telescopic forks |
| Rear Suspension: | Mono-cross | Dual shocks | Dual rear shock pre-load adjustable |
| Front Brakes: | Drum | Single disc | Single240mm disc |
| Rear Brakes: | Drum | Drum | 130 mm Drum |
| Front Tyre: | 3.00-21 | 3.50-19 | 2.75-18 |
| Rear Tyre: | 4.60-18 | 4.00-16 | 3.00-18 |
| Wheelbase: | 1405 mm / 55.3 in | 1410 mm / 55.5 IN | 1245 mm / 49.0 in |
| Fuel Capacity: | 11.4 Litres / 3.0 US gal | 12 Litres / 3.2 gal | 11.5 Litres / 3.04 US gal |