Yamaha XS 400 (1977-78) vs Yamaha XV 250 Virago (1997-99) vs Yamaha RD 125 (1977) vs Yamaha XS 250 (1977-81) vs Yamaha RD / RZ 125LC (1981-82)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Yamaha | Yamaha | Yamaha |
| Model: | XS 400 | XV 250 Virago | RD 125 | XS 250 | RD / RZ 125LC |
| Years: | 1977-78 | 1997-99 | 1977 | 1977-81 | 1981-82 |
| Engine: | Four stroke, 180° parallel twin, SOHC, 2 valves per cylinder | Four stroke, V-Twin cylinder, SOHC, 2 valve per cylinder | Two stroke, parallel twin | Four stroke, 180° parallel twin, SOHC, 2 valves per cylinder | Two stroke, single cylinder |
| Capacity: | 392 cc / 23.9 cu-in | 249 cc / 15.2 cu-in | 124 cc / 7.6 cu-in | 248 cc / 15.2 cu-in | 123 cc / 7.5 cu-in |
| Bore x Stroke: | 69.0 x 52.4 mm | 49 x 66 mm | 43 х 43 mm | 55 х 52.4 mm | 56 х 50 mm |
| Cooling System: | Air cooled | Air cooled | Air cooled | Air cooled | Liquid cooled |
| Compression Ratio: | 9.2:1 | 10.0:1 | 6.8:1 | 9.6:1 | 6.4:1 |
| Induction: | 2x Mikuni BS32 carburetors | BDS26 Mikuni carburetor | 2x 18mm Teikei carburetors | 2x 32mm Mikuni carburators | 24mm Mikuni carburetors |
| Ignition: | Battery ignition - With contact breaker points | CDI | Battery coil | Coil and cb | Hitachi CDI |
| Starting: | Electric & kick | Electric | Kick | Kick | Kick |
| Max Power: | 36 hp / 26.8 kW @ 8100 rpm | 23 hp / 17.1 Kw @ 8000 rpm | 17 hp / 12.4 kW @ 8500 rpm | 27 hp / 20.1 kW @ 9500 rpm | 20 hp / 15.5 kW @ 9500 rpm |
| Max Torque: | 3.3 kgf-m / 23.8 lb-ft @ 8000 rpm | 2.2 kgf-m / 15.9 lb-ft @ 6000 rpm | 1.3 kgf-m @ 8000 rpm | 2.2 kgf-m / 15.9 lb-ft @ 8500 rpm | 1.6 kgf-m / 16 Nm @ 9250 rpm |
| Transmission: | 6 Speed | 5 Speed | 5 Speed | 6 Speed | 6 Speed |
| Final Drive: | Chain | Chain | Chain | Chain | Chain |
| Front Suspension: | Telescopic fork | Telescopic forks | 28 mm telescopic forks | Telescopic forks | 32mm Telescopic forks |
| Rear Suspension: | Dual shocks swing arm, preload adjustable | Dual shocks | Dual rear shock pre-load adjustable | Dual shocks, swing arm, 5-position preload adjustable | Monocross linkage 6-way preload adjustment |
| Front Brakes: | Single disc | Single 282mm disc | Single240mm disc | Single 267mm disc | Single 245mm disc |
| Rear Brakes: | Drum | 130mm drum | 130 mm Drum | 178mm Drum | 130mm Drum |
| Front Tyre: | 3.00-18 | 3.00-19 | 2.75-18 | 3.00-18 | 2.75-18-4PR |
| Rear Tyre: | 3.50-18 | 130/90-15 | 3.00-18 | 3.50-18 | 3.00-18-6PR |
| Wheelbase: | 1364 mm / 53.7 in | 1495 mm / 58.9 in | 1245 mm / 49.0 in | 1359 mm / 53.5 in | 1295 mm / 50.9 in |
| Seat Height: | 780 mm / 30.7 in | 685 mm / 27.0 in | 749 mm / 29.5 in | 810 mm / 31.8 in | 775 mm / 30.5 in |
| Fuel Capacity: | 14 Litres / 3.7 US gal | 9.5 Liters / 2.5 US gal | 11.5 Litres / 3.04 US gal | 14 Litres / 3.7 US gal | 13 Litres / 3.4 US gal |