Yamaha WR 450F (2007-08) vs Yamaha XJ 750E (1981-82)
Comparison technical specifications
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| Make: | Yamaha | Yamaha |
| Model: | WR 450F | XJ 750E |
| Years: | 2007-08 | 1981-82 |
| Engine: | Four stroke, single cylinder, DOHC, 5 titanium valve per cylinder. | Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder. |
| Capacity: | 449 cc / 27.4 in | 749 cc / 45.6 cu-in |
| Bore x Stroke: | 95 x 63.4 mm | 65 х 56.4 mm |
| Cooling System: | Liquid cooled | Air cooled |
| Compression Ratio: | 12.5:1 | 9.2:1 |
| Induction: | 39mm Keihin FCR flat-slide throttle position sensor | 4x 32mm Hitachi carburetors |
| Ignition: | Digital CDI | Transistorized |
| Starting: | Electric / Kick-starter | Electric |
| Max Power: | 58 hp / 42.3 kW @ 9000 rpm | 81 hp / 59.6 kW @ 9000 rpm |
| Max Torque: | 49 Nm / 33.1 lb-ft @ 7000 rpm | 48.5 Nm / 35.7 lb-ft @ 7000 rpm |
| Clutch: | Wet, multiple discs, cable operated | Wet Multiplate |
| Transmission: | 5 Speed | 5 Speed |
| Final Drive: | "O" ring Chain | Chain |
| Front Suspension: | 46mm Kayaba inverted telescopic fork, compression and rebound damping adjustable | 36mm Showa forks adjustable air pressure anti-dive resistance.150mm wheel travel. |
| Rear Suspension: | Fully adjustable Kayaba single shock, 315mm wheel travel, separate speed compression adjustment | Dual dampers adjustable for spring preload rebound damping.97.5 wheel travel. |
| Front Brakes: | Single 250mm disc 4 piston caliper | 2x 300mm disc 2 piston calipers |
| Rear Brakes: | Single 245mm disc 2-piston caliper | Drum |
| Front Tyre: | 80/100-21 | 3.25-19 |
| Rear Tyre: | 110/100-18 | 120/90-18 |
| Dry Weight: | 112.5 kg / 248 lbs | 214 kg /471.4 lbs |
| Wet Weight: | 122 kg / 268 lbs | 235 kg / 518 lbs |
| Fuel Capacity: | 8 Liters / 2.1 US gal | 19 Litres / 5.0 US gal |