| MODEL | KTM 640 DUKE II 2003 - 2004 |
| Year | 2003 - 2004 |
| Engine Type | Four stroke, single cylinder, SOHC, 4 valves, engine balancer |
| Displacement / Capacity | 624.6 cc / 38.1 cu in |
| Bore X Stroke | 101 x 78 mm |
| Compression Ratio | 11.5:1 |
| Cooling System | Liquid cooled |
| Max Power | 40.1 kW / 55 hp @ 7000 rpm |
| Max Torque | 60 Nm / 6.1 kgf-m / 44.3 lb-ft @ 5500 rpm |
| Ignition | Kokusan contactless DC-CDI with advanced system |
| Induction | Mikuni BST 40 carburettor |
| Start System | Electric & kick |
| TRANSMISSION SPECS | |
| Lubrication | 2 x oil pumps |
| Gear Box | 5 Speed |
| Clutch | Multi-disc in oil bath |
| Final Drive | Chain, O-ring 5/8 x 1/4 in; final drive ratio 17:38 |
| CHASSIS SPECS | |
| Frame | Central chrome-moly steel frame |
| Front Suspension | WP 4054 Roma top adjuster, preload, compression and rebound adjustable; 140 mm / 5.5 in wheel travel |
| Rear Suspension | Central shock absorber WP IBS with PRO-LEVER linkage to swingarm; 170 mm / 6.7 in wheel travel |
| Front Brakes | Single 320 mm disc, 4 piston caliper |
| Rear Brakes | Single 220 mm disc, 1 piston caliper |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 860 mm / 33.9 in |
| Wheelbase | 1460 mm / 57.5 in |
| Ground Clearance | 250 mm / 9.9 in |
| Dry Weight | 145 kg / 320 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 120/70 - ZR17 58H |
| Rear Tyre | 160/60 - ZR17 69H |
| FUEL SYSTEM | |
| Fuel Capacity | 11.3 L / 3.0 US gal / 2.4 Imp gal |
| Fuel Consumption | — |
| Top Speed | 162 km/h / 101 mph |
The 2003-04 Duke II keeps the 624 cc balancer single, steel cradle frame and WP suspension of the range. Its 1460 mm wheelbase and light weight gave it strong braking and quick turning, while the review noted weak touring comfort and a high price. It was a sporty supermoto for riders who prioritised handling over long-distance comfort.
