Yamaha WR 250F (2003-04) vs Yamaha XJ 400 Seca (1980-81)
Comparison technical specifications
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| Make: | Yamaha | Yamaha |
| Model: | WR 250F | XJ 400 Seca |
| Years: | 2003-04 | 1980-81 |
| Engine: | Four stroke, single cylinder, DOHC, 5 valve | Four stroke, transverse four cylinder. DOHC |
| Capacity: | 249 cc / 15.2 cu-in | 398 cc / 24.2 cu-in |
| Bore x Stroke: | 77 x 53.6 mm | 51 х 48.8 mm |
| Cooling System: | Liquid cooled, | Air cooled |
| Compression Ratio: | 12.5:1 | 9.7:1 |
| Induction: | Keihin FCR-MX37 flat-slide w/throttle position sensor) | 2x 34mm Mikuni carburetor |
| Ignition: | Digital CDI | Battery powered inductive |
| Starting: | Electric & Kick | Electric |
| Transmission: | 5 Speed | 6 Speed |
| Final Drive: | Chain | Chain |
| Front Suspension: | 48mm Fully adjustable inverted forks | 35mm Telescopic forks |
| Front Wheel Travel: | 300 mm / 11.8 in | 142 mm / 5.6 in |
| Rear Suspension: | Fully adjustable link Monocross | Single shock, adjustable spring preload |
| Rear Wheel Travel: | 305 mm / 12.0 in | 96 mm / 3.8 in |
| Front Brakes: | Single 250mm disc 2 piston caliper | Single disc 1 piston caliper |
| Rear Brakes: | Single 240mm disc 1 piston caliper | Drum |
| Front Tyre: | 80/100-21 | 3.00-19 |
| Rear Tyre: | 100/100-18 | 110 90-18 |
| Dry Weight: | 106 kg / 233.2 lbs | 176 kg / 388 lbs |
| Fuel Capacity: | 8 Liters / 2.1 US gal | 15 Litres / 3.9 US gal |