Yamaha XJ 400 Special (1981) vs Yamaha DT 125 (1977) vs Yamaha XV 920R (1981-82) vs Yamaha TT-R 250 (1999-00)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Yamaha | Yamaha |
| Model: | XJ 400 Special | DT 125 | XV 920R | TT-R 250 |
| Years: | 1981 | 1977 | 1981-82 | 1999-00 |
| Engine: | Four stroke, transverse four cylinder. DOHC | Two stroke, single cylinder, reed-valve | Four stroke, 75° V-twin cylinder, SOHC. 2 valve per cylinder | Four stroke, single cylinder, DOHC, 4-valve per cylinder. |
| Capacity: | 398 cc / 24.2 cu-in | 123 cc / 7.5 cu-in | 920 cc / 56.1 cu-in | 249 cc / 15.1 cu-in |
| Bore x Stroke: | 51 х 48.8 mm | 56 х 50 mm | 92 х 69.2 mm | 73 x 59.6 mm |
| Cooling System: | Air cooled | Air cooled | Air cooled, | Air-cooled |
| Compression Ratio: | 9.7:1 | 7.2:1 | 8.3:1 | 10.3:1 |
| Induction: | 2x 34mm Mikuni carburetor | Single 24 mm Mikuni carburettor | 2x 40mm Hitachi carburetor | TEIKEI Y30P carb |
| Ignition: | Battery powered inductive | Magneto | Transistorized | Digital CDI |
| Starting: | Electric | Kick | Electric | Electric |
| Max Power: | 45 hp / 32.8 kW @ 10000 rpm | 13 hp / 9.5 kW @ 7000 rpm | 65 hp / 48.4 Kw @ 6500 rpm | 28 hp / 20.6 kW @ 8500 rpm |
| Max Torque: | 3.5 kgf-m / 25 lb-ft@ 8000 rpm | 9.8 lb-ft @ 6,500 rpm | 7.8 kgf-m / 56.4 lb-ft @ 5000 rpm | 2.8 kgf-m / 27.1 Nm / 20.0 lb-ft @ 7000 rpm |
| Transmission: | 6 Speed | 6 Speed | 5 Speed | 6 Speed |
| Final Drive: | Chain | Chain | Shaft | Chain |
| Front Suspension: | 35mm Telescopic forks | Telescopic forks | 37mm Showa leading axle. adjustment for air pressure and rebound damping | Telescopic forks, Coil air spring oil damper |
| Rear Suspension: | Single shock, adjustable spring preload | Monocross | Monoshock single damper, adjustment for air pressure and rebound damping | Monocross, Single shock, link-type, w/adjustable preload |
| Front Brakes: | Single discs 2 piston caliper | Drum | 2x 267mm disc 2 piston calipers | Single 245mm disc |
| Rear Brakes: | Drum | Drum | Drum | Single 220mm disc |
| Front Tyre: | 3.00-19 | 2.75-21 | 3.50-19 | 3.00-21 |
| Rear Tyre: | 110 90-18 | 3.50-18 | 120/90-18 | 4.60-18 |
| Fuel Capacity: | 15 Litres / 3.9 US gal | 6.8 Litres / 1.8 gal | 14.5 Litres / 3.8 US gal | 10.2 Litres / 2.7 US gal |