| Attribute | Yamaha YZ125 2011 × | Yamaha YZ125 2010 × |
|---|---|---|
| General | ||
| Production from (year) | 2011 | 2010 |
| Make | Yamaha | Yamaha |
| Model | Yamaha YZ125 | Yamaha YZ125 |
| Category | Cross / motocross | Cross / motocross |
| Engine and transmission | ||
| Engine type | Single cylinder, two-stroke | Single cylinder, two-stroke |
| Fuel system | Carburettor. Mikuni TMX 38 | Carburettor. Mikuni® TMX 38 |
| Displacement (cm³) | 124 | 124 |
| Cooling system | Liquid | Liquid |
| Transmission type,final drive | Chain | Chain |
| Bore (mm) | 54 | 54 |
| Stroke (mm) | 54.5 | 54.5 |
| Gearbox | 6-speed | 6-speed |
| Ignition | CDI | CDI |
| Lubrication system | Dry sump | - |
| Compression | 8.6:1 | 8.6:1 |
| Chassis | ||
| Front suspension | Speed-sensitive system inverted fork | Speed-sensitive system inverted fork |
| Rear suspension | Fully adjustable single shock | Fully adjustable single shock |
| Front brakes | Single disc. Wave | Single disc |
| Rear brakes | Single disc. Wave | Single disc |
| Diameter (mm) | 245 | 245 |
| Frame type | Aluminium | - |
| Front tyre | 80/100-M21 | 80/100-M21 |
| Rear tyre | 100/90-M19 | 100/90-M19 |
| Front wheel travel (mm) | 300 | 300 |
| Rear wheel travel (mm) | 315 | 315 |
| Other | ||
| Color options |
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| Dimensions | ||
| Wheelbase (mm) | 1,443 | 1,443 |
| Kerb weight (kg) | 94.4 | 94.3 |
| Overall height (mm) | 1,316 | 1,316 |
| Overall length (mm) | 2,136 | 2,136 |
| Overall width (mm) | 828 | 828 |
| Seat height (mm) | 998 | 998 |
| Ground clearance (mm) | 386 | 386 |
| Performance | ||
| Fuel capacity (l) | 7.95 | 7.94 |
| Oil capacity (l) | 0.7 | - |