| Engine | Yamaha YBR 125 | Yamaha WR450F |
|---|---|---|
| Displacement | 125 cc | 449 cc |
| Max power | 10 hp (@7 800 RPM) | 50 hp (@8 500 RPM) |
| Max torque | 9 Nm (@6 000 RPM) | 50 Nm (@7 500 RPM) |
| Redline | 10 000 RPM | 11 500 RPM |
| Idling speed | 1 250 RPM | 1 900 RPM |
| Management | Fuel Injection | Fuel Injection |
| Layout | SOHC Single | DOHC Single |
| Compression | 10.00:1 | 12.30:1 |
| Oil capacity | 1.20 litre | 1.00 litre |
| Oil type | 10W30, 10W40 | 10W40 |
| Spark plug type | NGK CR6HSA | NGK CR8E |
| Cooling | Air | Liquid |
| Valves | 2 | 5 |
| Bore | 54.0 mm | 95.0 mm |
| Stroke | 54.0 mm | 63.4 mm |
| Throttle bore | 42.0 mm | |
| Weight to power | 13.00 kg/hp | 2.48 kg/hp |
| Power to weight | 76 hp/Ton | 403 hp/Ton |
| Battery type | YTX7L-BS, 12V 6Ah | 12V 6Ah, YTZ7S (F) |
| Gearbox | Yamaha YBR 125 | Yamaha WR450F |
|---|---|---|
| Type | Sequential | Sequential |
| Clutch | Wet | Wet |
| Drive | Chain | Chain |
| Chain type | DAIDO 520VM2 114 links | |
| Gears count | 5 | 5 |
| Primary ratio | 3.4 | 2.652 |
| Final drive | 3.071 | 3.846 |
| 1. gear | 2.643 (42 km/h) | 2.417 (59 km/h) |
| 2. gear | 1.778 (63 km/h) | 1.733 (83 km/h) |
| 3. gear | 1.316 (85 km/h) | 1.313 (109 km/h) |
| 4. gear | 1.045 (107 km/h) | 1.05 (136 km/h) |
| 5. gear | 0.875 (128 km/h) | 0.84 (170 km/h) |
| Chasis | Yamaha YBR 125 | Yamaha WR450F |
|---|---|---|
| Frame type | Diamond steel | Bilateral beam aluminum |
| Front susp. | Telescopic fork, 110mm | 48mm USD, 300.00 mm travel |
| Rear susp. | Swingarm, 105.00 mm travel | Swingarm monoshock, 294.00 mm travel |