| KTM125EXC 1999 | |
| Motor | |
| Displacement | 124.8cc |
| Bore/Stroke | 54.25*54mm |
| Transmission | 6 speeds |
| Secondary ratio | 13:50 |
| Chain pitch | 5/8"*1/4" O-Ring |
| Fuel tank capacity | 9.5 liters |
| Fuel | 98 ROZ Eurosuper Plus 1:40 |
| Carburetor | Keihin PWK 39mm |
| Clutch | wet clutch, hyd. |
| Ignition system | kokusan digital 2K-3 |
| Chasis | |
| Mainframe | chromium-molybdenium |
| Rear end | aluminium |
| Front fork | Marzocchi Magnum 45mm |
| Rear-wheel suspension | WP-PDS-Mono-shock |
| Suspension travel | front:285mm rear:320mm |
| Front rim | 1.60-21" DID |
| Rear rim | 2.15-18" DID |
| Front tire | 90/90-21" Bridgestone ED 661 |
| Rear tire | 120/90-18" Bridgestone ED 660 |
| Front brake | disc 260mm |
| Rear brake | disc 220mm |
| Steering-head angle | 27 |
| Wheel base | 1461+/-10mm |
| Seat hight | 925mm |
| Ground clearance | 380mm |
| Weight | 96kg |