| Engine | Yamaha MT-15 | Yamaha YBR 125 |
|---|---|---|
| Engine code | LC 4V | |
| Displacement | 155 cc | 125 cc |
| Max power | 19 hp (@10 000 RPM) | 10 hp (@7 800 RPM) |
| Max torque | 11 lb ft (@8 500 RPM) | 6 lb ft (@6 000 RPM) |
| Redline | 11 000 RPM | 10 000 RPM |
| Idling speed | 1 100 RPM | 1 250 RPM |
| Management | Fuel Injection | Fuel Injection |
| Layout | SOHC Single | SOHC Single |
| Compression | 11.60:1 | 10.00:1 |
| Oil capacity | 0.80 quart | 1.14 quart |
| Oil type | 10W40 | 10W30, 10W40 |
| Spark plug type | NGK MR8E9 | NGK CR6HSA |
| Cooling | Liquid | Air |
| Valves | 4 | 2 |
| Bore | 58.0 mm | 54.0 mm |
| Stroke | 58.7 mm | 54.0 mm |
| Weight to power | 16.01 lbs/hp | 28.66 lbs/hp |
| Power to weight | 156 hp/2500lbs | 87 hp/2500lbs |
| Battery type | 12V 4Ah, YTZ4V | YTX7L-BS, 12V 6Ah |
| Gearbox | Yamaha MT-15 | Yamaha YBR 125 |
|---|---|---|
| Type | Sequential | Sequential |
| Clutch | Wet | Wet |
| Drive | Chain | Chain |
| Chain type | RK 428 | |
| Gears count | 6 | 5 |
| Primary ratio | 3.042 | 3.4 |
| Final drive | 3.714 | 3.071 |
| 1. gear | 2.833 (25 mph) | 2.643 (26 mph) |
| 2. gear | 1.875 (38 mph) | 1.778 (39 mph) |
| 3. gear | 1.364 (52 mph) | 1.316 (53 mph) |
| 4. gear | 1.143 (63 mph) | 1.045 (66 mph) |
| 5. gear | 0.957 (75 mph) | 0.875 (79 mph) |
| 6. gear | 0.84 (85 mph) |
| Chasis | Yamaha MT-15 | Yamaha YBR 125 |
|---|---|---|
| Frame type | Deltabox steel | Diamond steel |
| Front susp. | Telescopic fork, 5.12 in travel | Telescopic fork, 110mm |
| Rear susp. | Monoshock, 3.82 in travel | Swingarm, 4.13 in travel |