| MODEL | KTM 390 ADVENTURE X 2025 |
| Year | 2025 |
| Engine Type | Four stroke, single cylinder, DOHC with finger followers, 4 valves |
| Displacement / Capacity | 398.7 cc / 24.3 cu in |
| Bore X Stroke | 89 x 64 mm |
| Compression Ratio | 12.6:1 |
| Cooling System | Liquid cooled |
| Max Power | 44.3 hp / 33 kW @ 8500 rpm |
| Max Torque | 39 Nm / 28.7 lb-ft @ 7000 rpm |
| Ignition | — |
| Induction | Bosch fuel injection, 46 mm throttle body |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 6 speed (primary drive 86:33) |
| Clutch | PASC slipper clutch, mechanically operated |
| Final Drive | Chain, 520 X-Ring |
| CHASSIS SPECS | |
| Frame | Two-piece steel trellis frame, powder coated, with bolt-on subframe |
| Front Suspension | 43 mm WP APEX 43, open cartridge, non-adjustable, 200 mm / 7.9 in travel |
| Rear Suspension | WP APEX emulsion, 200 mm / 7.9 in travel |
| Front Brakes | Single 320 mm disc, Bybre axial 2-piston caliper |
| Rear Brakes | Single 240 mm disc, Bybre 1-piston floating caliper |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 825 mm / 32.5 in |
| Wheelbase | 1464 mm / 57.6 in |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | 165 kg / 364 lbs |
| WHEEL SPECS | |
| Front Tyre | 100/90 x R19 M/C 54T TL M+S |
| Rear Tyre | 130/80 x R17 M/C 70T M+S |
| FUEL SYSTEM | |
| Fuel Capacity | 14 L / 3.7 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The 390 Adventure X is the 2025 cast-wheel, street-leaning version of the new 398.7 cc LC4c 390 Adventure range. It shares the engine, steel trellis frame, slipper clutch and ride-by-wire throttle with the R, but uses 19-inch front and 17-inch rear cast wheels, 200 mm of suspension travel, a non-adjustable open-cartridge WP APEX fork and a lower seat. It replaces the earlier 390 Adventure in the line-up.
