| MODEL | KTM 400 EXC 2000 - 2001 |
| Year | 2000 - 2001 |
| Engine Type | Four stroke, single cylinder, SOHC, 4 valves |
| Displacement / Capacity | 398 cc / 24.3 cu in |
| Bore X Stroke | 89 x 64 mm |
| Compression Ratio | 11.5:1 |
| Cooling System | Liquid cooled |
| Max Power | 44 hp / 32.1 kW @ 8000 rpm |
| Max Torque | — |
| Ignition | Kokusan digital, NGK CR8EK spark plug |
| Induction | Keihin MX-FCR 39 |
| Start System | Electric and kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6 speed (primary drive 30:81; gears 14:34, 17:31, 19:28, 22:26, 24:23, 26:21) |
| Clutch | — |
| Final Drive | Chain, O-ring (final ratio 14:50) |
| CHASSIS SPECS | |
| Frame | Chrome-moly main frame, aluminium swingarm, 26.5 degree rake |
| Front Suspension | WP 43 mm upside-down fork, 295 mm / 11.6 in travel |
| Rear Suspension | Fully adjustable WP PDS shock, 320 mm / 12.6 in travel |
| Front Brakes | Single 260 mm disc, Brembo double-piston caliper, sintered pads |
| Rear Brakes | Single 220 mm disc, Brembo single-piston caliper, organic pads |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 925 mm / 36.4 in |
| Wheelbase | 1481 mm / 58.3 in |
| Ground Clearance | 380 mm / 15.0 in |
| Dry Weight | 112 kg / 247 lbs |
| Wet Weight | 122 kg / 269.0 lbs |
| WHEEL SPECS | |
| Front Tyre | 80/100-21 (Bridgestone M77) |
| Rear Tyre | 110/100-18 (Bridgestone M78) |
| FUEL SYSTEM | |
| Fuel Capacity | 8.5 L / 2.25 US gal / 1.9 Imp gal |
| Fuel Consumption | — |
| Top Speed | — |
The 400 EXC is KTM's competition-oriented 398 cc single, with a four-valve SOHC head, a Keihin carburettor and a fully adjustable WP rear shock. A 1996 road test described it as a motocross-style machine with strong mid-range power, light weight and quality parts such as Magura bars. The reviewer also noted slight front fork stiction, which they put down to needing service.
