| Attribute | KTM 125 SX 2019 × | KTM 125 SX 2018 × |
|---|---|---|
| General | ||
| Production from (year) | 2019 | 2018 |
| Make | KTM | KTM |
| Model | KTM 125 SX | KTM 125 SX |
| Category | Cross / motocross | Cross / motocross |
| Engine and transmission | ||
| Engine type | Single cylinder, two-stroke | Single cylinder, two-stroke |
| Fuel system | Carburettor. Mikuni TMX | Carburettor. Mikuni TMX |
| Engine details | Reed intake. | Reed intake. |
| Displacement (cm³) | 124.8 | 124.8 |
| 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 |
| Driveline | 13:50. Primary drive: 23:73. | 13:50. Primary drive: 23:73. |
| Ignition | Kokusan EMS | Kokusan EMS |
| Clutch | Wet multi-disc clutch, hydraulically actuated | Multi-plate clutch, Brembo hydraulics |
| Chassis | ||
| Front suspension | WP-USD, AER 48, Ø 48 mm | WP-USD, AER 48, Ø 48 mm |
| Rear suspension | WP shock absorber with linkage | WP shock absorber with linkage |
| Front brakes | Single disc. Brake calipers on floating bearings | Single disc. Brake calipers on floating bearings |
| Rear brakes | Single disc. Brake calipers on floating bearings | Single disc. Brake calipers on floating bearings |
| Diameter (mm) | 220 | 220 |
| Frame type | Chrome-molybdenum steel central-tube frame | Chrome-molybdenum steel central-tube frame |
| Wheels | CNC machined hubs. Excel rims. Wire spoked. | CNC machined hubs. Excel rims. Wire spoked. |
| Front wheel travel (mm) | 310 | 300 |
| Rear wheel travel (mm) | 300 | 300 |
| Rake (fork angle) (degree) | 26.1 | 26.5 |
| Other | ||
| Starter | Kick | Kick |
| Color options |
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| Dimensions | ||
| Wheelbase (mm) | 1,485 | 1,485 |
| Dry weight (kg) | 87 | 87 |
| Seat height (mm) | 950 | 960 |
| Ground clearance (mm) | 375 | 375 |
| Performance | ||
| Fuel capacity (l) | 7.5 | 7 |