Yamaha XJ 650 Seca (1981) vs Yamaha XS 250 (1977-81) vs Yamaha XZ 550R Vision (1983) vs Yamaha TT-R 250 (1997-98)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Yamaha | Yamaha |
| Model: | XJ 650 Seca | XS 250 | XZ 550R Vision | TT-R 250 |
| Years: | 1981 | 1977-81 | 1983 | 1997-98 |
| Engine: | Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder, | Four stroke, 180° parallel twin, SOHC, 2 valves per cylinder | Four stroke, 70°V-twin cylinder. DOHC, 4 valve per cylinder | Four stroke, single cylinder, DOHC, 4-valve per cylinder. |
| Capacity: | 653 cc / 39.8 cu-in | 248 cc / 15.2 cu-in | 552 cc / 33.7 lb-ft | 249 cc / 15.1 cu-in |
| Bore x Stroke: | 63 х 52.4 mm | 55 х 52.4 mm | 80 х 55 mm | 73 x 59.6 mm |
| Cooling System: | Air-cooled | Air cooled | Liquid cooled | Air-cooled |
| Compression Ratio: | 9.2:1 | 9.6:1 | 10.4:1 | 10.3:1 |
| Induction: | 4x 32mm Hitachi carburetors | 2x 32mm Mikuni carburators | 2x 36mm Mikuni carburetors | TEIKEI Y30P carb |
| Ignition: | Transistorized | Coil and cb | Battery powered inductive | Digital CDI |
| Starting: | Electric | Kick | Electric | Electric |
| Max Power: | 71 hp / 51.8 kW @ 9400 rpm | 27 hp / 20.1 kW @ 9500 rpm | 64 hp / 46.7 kW @ 9500 rpm | 28 hp / 20.6 kW @ 8500 rpm |
| Max Torque: | 57 Nm / 42 lb-ft @ 7500 rpm | 2.2 kgf-m / 15.9 lb-ft @ 8500 rpm | 4.8 kgf-m / 34.7 lb-ft @ 8500 rpm | 2.8 kgf-m / 27.1 Nm / 20.0 lb-ft @ 7000 rpm |
| Transmission: | 5 Speed | 6 Speed | 5 Speed | 6 Speed |
| Final Drive: | Shaft | Chain | Shaft | Chain |
| Front Suspension: | 36mm Kayaba forks | Telescopic forks | Telescopic oil damped forks | Telescopic forks, Coil air spring oil damper |
| Rear Suspension: | Duel Kayaba shocks | Dual shocks, swing arm, 5-position preload adjustable | Gas filled monoshock, 2-way adjustable. | Monocross, Single shock, link-type, w/adjustable preload |
| Front Brakes: | 2x 268mm disc 1 piston calipers | Single 267mm disc | 2x 266mm discs | Single 245mm disc |
| Rear Brakes: | Drum | 178mm Drum | Single 177mm drum | Single 220mm disc |
| Front Tyre: | 3.25-19 | 3.00-18 | 100/90-18 | 3.00-21 |
| Rear Tyre: | 120/90-18 | 3.50-18 | 110/90-18 | 4.60-18 |
| Dry Weight: | 206 kg / 465 lbs | 165.5 kg / 365 lbs | 188 kg / 414.4 lbs | 113 kg / 249 lbs |
| Fuel Capacity: | 19.5 Litres / 5.1 US gal | 14 Litres / 3.7 US gal | 17 Litres / 4.4 US gal | 10.2 Litres / 2.7 US gal |