| MODEL | KTM 660 RALLY 2003 - 2006 |
| Year | 2003 - 2006 |
| Engine Type | Four stroke, single cylinder, SOHC, 4 valves |
| Displacement / Capacity | 653.7 cc / 39.9 cu in |
| Bore X Stroke | 102 x 80 mm |
| Compression Ratio | 11.5:1 |
| Cooling System | Liquid cooled |
| Max Power | 48 kW / 65.2 hp @ 7500 rpm |
| Max Torque | 69 Nm / 7.04 kgf-m / 50.9 lb-ft @ 6000 rpm |
| Ignition | DC-CDI, Kokusan contactless |
| Induction | 40 mm carburettor |
| Start System | Kick & electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 speed |
| Clutch | Wet, multiple discs, cable operated |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Steel single cradle frame |
| Front Suspension | 50 mm WP upside-down fork, 295 mm / 11.6 in travel |
| Rear Suspension | WP monoshock, swingarm, 320 mm / 12.5 in travel |
| Front Brakes | Single 320 mm disc |
| Rear Brakes | Single 220 mm disc |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 980 mm / 38.5 in |
| Wheelbase | 1510 mm / 59.4 in |
| Ground Clearance | 320 mm / 12.5 in |
| Dry Weight | 162 kg / 357 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 90/90 - 21 |
| Rear Tyre | 140/90 - 18 |
| FUEL SYSTEM | |
| Fuel Capacity | 55 L / 14.5 US gal / 12.1 Imp gal |
| Fuel Consumption | — |
| Top Speed | — |
A purpose-built rally-raid version of the single-cylinder 660 with a 653.7 cc, 102 x 80 mm engine and a carburettor, aimed at long-distance desert racing such as the Dakar. It uses a 50 mm WP fork, a WP monoshock, a 21-inch front wheel and a large fuel tank for range between fuel stops. The page describes it as a small, hard-to-find production run for 2006, with a steering damper and trip instruments added for navigation.
