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KTM's first-generation RFS four-strokes of 2000–2007 (400, 450 MXC, 520, 525) and the 400s that carried into the XC4 era to 2011.
| 448 cc |
| Four-stroke |
| 2003 |
| 2005 |
| 450 SX | 449 cc | Four-stroke | 2003 | 2006 |
| 450 XC | 449 cc | Four-stroke | 2006 | 2007 |
| 525 MXC | 510 cc | Four-stroke | 2000 | 2005 |
| 525 SX | 510 cc | Four-stroke | 2000 | 2006 |
| 525 XC | 510 cc | Four-stroke | 2006 | 2007 |