| MODEL | KTM 640 LC4 ADVENTURE 2006 - 2007 |
| Year | 2006 - 2007 |
| Engine Type | Four stroke, single cylinder, SOHC, 4 valves per cylinder |
| Displacement / Capacity | 624.6 cc / 38.1 cu in |
| Bore X Stroke | 101 x 78 mm |
| Compression Ratio | 11.0:1 |
| Cooling System | Liquid cooled |
| Max Power | 35.7 kW / 49 hp @ 7500 rpm |
| Max Torque | 52 Nm / 5.3 kgf-m / 38.4 lb-ft @ 5500 rpm |
| Ignition | Kokusan contactless DC-CDI ignition with digital advanced system |
| Induction | Mikuni BST 40 carburetor |
| Start System | Kick & electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 speed, claw shifted (primary drive 30:81; 1st 14:35 / 2nd 15:24 / 3rd 18:21 / 4th 20:19 / 5th 22:18) |
| Clutch | Wet, multiplate |
| Final Drive | Chain (final drive ratio 16:40) |
| CHASSIS SPECS | |
| Frame | Central chrome-moly steel frame |
| Front Suspension | 50 mm WP upside-down forks; 300 mm / 11.8 in travel |
| Rear Suspension | WP monoshock; 320 mm / 12.6 in travel |
| Front Brakes | 2 x 300 mm discs |
| Rear Brakes | Single 220 mm disc, 1-piston floating caliper |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 945 mm / 37.2 in |
| Wheelbase | 1510 mm / 59.4 in |
| Ground Clearance | 320 mm / 12.6 in |
| Dry Weight | 158.0 kg / 348.3 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 90/90 - 21 54S Enduro 3 |
| Rear Tyre | 140/80 - 18 70R Enduro 3 |
| FUEL SYSTEM | |
| Fuel Capacity | 28 L / 7.4 US gal / 6.2 Imp gal (reserve 3.8 L / 1.0 US gal / 0.8 Imp gal) |
| Fuel Consumption | — |
| Top Speed | — |
The 2006-2007 640 Adventure is the late-production version of KTM's LC4 dual-sport single, with the same 624.6 cc engine, 28 L tank and twin front discs as the 2004-2005 bike. Its versatile, agile character suits long-distance riding on mixed surfaces. The source's review praises the bike's overall dedication to versatility rather than outright power.
