Yamaha WR 250F (2007-08) vs Yamaha IT 400 (1977-78) vs BMW S 1000R (2018) vs Kawasaki ER-6n (2009)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | BMW | Kawasaki |
| Model: | WR 250F | IT 400 | S 1000R | ER-6n |
| Years: | 2007-08 | 1977-78 | 2018 | 2009 |
| Engine: | Four stroke, single cylinder, DOHC, 5 valve | Two stroke, single cylinder, read valve | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder | Four stroke, parallel twin, DOHC, 4 valves per cylinder. |
| Capacity: | 249 cc / 15.2 cu-in | 396 cc / 24.1 cu-in | 999 cc / 60.9 cu-in | 649 cc / 39.6 cu-in |
| Bore x Stroke: | 77 x 53.6 mm | 85 x 70 mm | 80 x 49.7 mm | 83 X 60mm |
| Cooling System: | Liquid cooled, | Air cooled | Liquid cooled | Liquid cooled, |
| Compression Ratio: | 12.5:1 | 7.6:1 | 12.0:1 | 11.3;1 |
| Induction: | Keihin FCR-MX37 flat-slide w/throttle position sensor) | VM38SS Mikuni carburetor | Electronic fuel injection, digital motor electronics BMS-KP | 2x 38mm Electronic Fuel Injection Keihin |
| Starting: | Electric / Kick | Kick | Electric | Electric |
| Transmission: | 5 Speed | 5 Speed | 6 Speed | 6 Speed |
| Final Drive: | #520 Chain | Chain | Chain 17/45 | Chain |
| Front Suspension: | 48mm Fully adjustable inverted forks | 43mm Telescopic adjustable forks | Upside-down fork, stanchion diameter 46 mm, adjustable for bump and rebound SA DDC: electronically adjustable damping | 41 mm telescopic fork, |
| Front Wheel Travel: | 300 mm / 11.8 in | 300 mm / 11.8 in | 120 mm / 4.7" | 120 mm / 4.7 in |
| Rear Suspension: | Fully adjustable link Monocross | Mono shock, adjustable spring preload and rebound damping | Aluminium double-strut swingarm with central spring strut, adjustable rebound, SA DDC: electronically adjustable damping | Offset laydown single-shock with adjustable preload, |
| Rear Wheel Travel: | 305 mm / 12.0 in | 300 mm / 11.8 in | 120 mm / 4.7" | 130 mm / 5.1 in |
| Front Brakes: | Single 250mm disc 2 piston caliper | Drum | 2 x 320mm Discs, 4 piston calipers | 2x 300mm discs 2 piston calipers |
| Rear Brakes: | Single 240mm disc 1 piston caliper | Drum | Single 220mm disc, 1 piston caliper | Single 220mm disc 1 piston caliper |
| Front Tyre: | 80/100-21 | 3.00 -21 | 120/70 ZR17 | 120/70ZR17 |
| Rear Tyre: | 100/100-18 | 150/80 -18 | 190/55 ZR17 | 160/60ZR17 |
| Wheelbase: | 1475 mm / 58.1 in | 1430 mm / 56.2 in | 1440 mm / 56.7 in | 1405 mm / 55.3 in |
| Fuel Capacity: | 8 Liters / 2.1 gal | 13.6 Litres / 3.4 US gal | 17.5 Litres / 4.6 US gal. | 15.5 Litres / 4.1 US gal |