| Engine | Yamaha MT-125 | Yamaha MT-15 |
|---|---|---|
| Engine code | LC 4V | |
| Displacement | 124 cc | 155 cc |
| Max power | 15 hp (@9 000 RPM) | 19 hp (@10 000 RPM) |
| Max torque | 8 lb ft (@8 000 RPM) | 11 lb ft (@8 500 RPM) |
| Redline | 10 000 RPM | 11 000 RPM |
| Idling speed | 1 200 RPM | 1 100 RPM |
| Management | Fuel Injection | Fuel Injection |
| Layout | SOHC Single | SOHC Single |
| Compression | 11.20:1 | 11.60:1 |
| Oil capacity | 1.14 quart | 0.80 quart |
| Oil type | 10W40 | |
| Spark plug type | NGK MR8E9 | |
| Cooling | Liquid | Liquid |
| Valves | 4 | 4 |
| Bore | 52.0 mm | 58.0 mm |
| Stroke | 58.6 mm | 58.7 mm |
| Weight to power | 20.58 lbs/hp | 16.01 lbs/hp |
| Power to weight | 121 hp/2500lbs | 156 hp/2500lbs |
| Battery type | 12V 5.5Ah | 12V 4Ah, YTZ4V |
| Gearbox | Yamaha MT-125 | Yamaha MT-15 |
|---|---|---|
| Type | Sequential | Sequential |
| Clutch | Wet | Wet |
| Drive | Chain | Chain |
| Chain type | RK 428 | |
| Gears count | 6 | 6 |
| Primary ratio | 3.042 | 3.042 |
| Final drive | 3.42 | 3.714 |
| 1. gear | 2.833 (24 mph) | 2.833 (25 mph) |
| 2. gear | 1.875 (37 mph) | 1.875 (38 mph) |
| 3. gear | 1.364 (51 mph) | 1.364 (52 mph) |
| 4. gear | 1.143 (60 mph) | 1.143 (63 mph) |
| 5. gear | 0.957 (72 mph) | 0.957 (75 mph) |
| 6. gear | 0.84 (82 mph) | 0.84 (85 mph) |
| Chasis | Yamaha MT-125 | Yamaha MT-15 |
|---|---|---|
| Frame type | Steel deltabox | Deltabox steel |
| Front susp. | KYB 41mm USD, 5.12 in travel | Telescopic fork, 5.12 in travel |
| Rear susp. | Swingarm monoshock, 4.49 in travel | Monoshock, 3.82 in travel |