Yamaha XJ 900F (1985-89) vs Yamaha WR 250Z (1996)
Comparison technical specifications
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| Make: | Yamaha | Yamaha |
| Model: | XJ 900F | WR 250Z |
| Years: | 1985-89 | 1996 |
| Engine: | Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder. | Two stroke, single cylinder |
| Capacity: | 891 cc / 54.3 cu-in | 249 cc / 15.2 cu-in |
| Bore x Stroke: | 68.5 x 60.5 mm | 68 x 68.8 mm |
| Cooling System: | Air cooled | Liquid cooled |
| Compression Ratio: | 9.6:1 | 10.9:1 |
| Induction: | 4x Mikuni BS36 | Mikuni VM38SS carburetor |
| Ignition: | CDI | CDI |
| Starting: | Electric | Kick |
| Max Power: | 98 hp / 72 kW @ 9000 rpm | 49.8 hp / 37.2 kW @ 8250 rpm |
| Max Torque: | 81 Nm / @ 7000 rpm | 4.69 kgf-m / 44.5 Nm @ 7500 rpm |
| Clutch: | Wet, 6 springs | Multi-plate wet clutch |
| Transmission: | 5 Speed | 5 Speed |
| Final Drive: | Shaft | Chain |
| Frame: | Steel tubular | CrMo steel |
| Front Suspension: | 37mm Telescopic fork | 43mm inverted fork |
| Rear Suspension: | Twin shock, Swingarm | Monocross, swinging arm |
| Front Brakes: | 2x 267mm discs | Single 204mm disc |
| Rear Brakes: | Single 267mm disc, | Single 189mm disc |
| Front Tyre: | 100/90-18 | 80/100-21 |
| Rear Tyre: | 120/90-18 | 110/100-18 |
| Wheelbase: | 1480 mm / 58.2 in | 1480 mm / 58.2 in |
| Seat Height: | 780mm / 30.7 in | 978 mm / 38.5 in |
| Ground clearance: | 145mm / 5.7 in | 398 mm / 15.6 in |
| Fuel Capacity: | 22 Litres / 5.8 US gal | 13 Litres / 3.4 US gal |