| Engine | Yamaha WR250R | Yamaha R125 |
|---|---|---|
| Displacement | 250 cc | 124 cc |
| Max power | 30 hp (@10 000 RPM) | 15 hp (@10 000 RPM) |
| Max torque | 16 lb ft (@8 000 RPM) | 8 lb ft (@8 000 RPM) |
| Redline | 11 500 RPM | 10 000 RPM |
| Idling speed | 1 200 RPM | 1 200 RPM |
| Management | Fuel Injection | Fuel Injection |
| Layout | DOHC Single | SOHC Single |
| Compression | 11.80:1 | 11.20:1 |
| Oil capacity | 1.33 quart | 1.14 quart |
| Oil type | 10W30, 10W40, YAMALUBE 10W40 | |
| Spark plug type | NGK CR9EK | |
| Cooling | Liquid | Liquid |
| Valves | 4 | 4 |
| Bore | 77.0 mm | 52.0 mm |
| Stroke | 53.6 mm | 58.6 mm |
| Weight to power | 20.87 lbs/hp | |
| Power to weight | 119 hp/2500lbs | |
| Battery type | YTZ7S, 12V 6Ah | 12V 5.5Ah |
| Gearbox | Yamaha WR250R | Yamaha R125 |
|---|---|---|
| Type | Sequential | Sequential |
| Clutch | Wet | Wet |
| Drive | Chain | Chain |
| Chain type | ||
| Gears count | 6 | 6 |
| Primary ratio | 3.12 | 3.042 |
| Final drive | 3.231 | 3.42 |
| 1. gear | 2.642 (33 mph) | 2.833 (24 mph) |
| 2. gear | 1.813 (48 mph) | 1.875 (37 mph) |
| 3. gear | 1.318 (66 mph) | 1.364 (51 mph) |
| 4. gear | 1.04 (83 mph) | 1.143 (60 mph) |
| 5. gear | 0.888 (97 mph) | 0.957 (72 mph) |
| 6. gear | 0.766 (113 mph) | 0.84 (82 mph) |
| Chasis | Yamaha WR250R | Yamaha R125 |
|---|---|---|
| Frame type | Semi double cradle | Steel deltabox |
| Front susp. | USD, 10.63 in travel | KYB 41mm USD, 5.12 in travel |
| Rear susp. | Swingarm monoshock, 10.43 in travel | Swingarm monoshock, 4.49 in travel |