The KTM 640 Adventure is a dual-sport motorcycle made by KTM from model years 1998 until 2007.
 2002 640 Adventure R | |
| Manufacturer | KTM |
|---|---|
| Production | 1998-2007 |
| Successor | KTM 690 Enduro |
| Class | Dual-sport |
| Engine | 620 cc (38 cu in) single cylinder, 4-stroke, Mikuni BST40, Pressure oil lubrication |
| Bore / stroke | 101 mm × 78 mm (4.0 in × 3.1 in) |
| Compression ratio | 11.7:1 |
| Power | 54 hp (40 kW)/7000rpm |
| Torque | 55 N⋅m (41 lbf⋅ft)/5500 rpm |
| Ignition type | Kokusan DC-CDI |
| Transmission | 5 gears, dog clutch engagement |
| Frame type | Chromium-molybdenum, power-coated |
| Suspension | Front: WP USD 48mm fork, Rear: WP monoshock with Pro Lever Linkage |
| Brakes | Front: Dual 320 mm disc (from 2004); Rear: Brembo 1-piston floating caliper, 220 mm disc |
| Tires | Front: 90/90-21"; Rear: 140/80-18" |
| Rake, trail | 62.5° |
| Wheelbase | 1,510 mm (59 in) ±10mm |
| Seat height | 945 mm (37.2 in) |
| Weight | 158 kg (348 lb) (dry) |
| Fuel capacity | 25.5 L (5.6 imp gal; 6.7 US gal), 3.5 L (0.77 imp gal; 0.92 US gal) reserve |
| Related | Duke 640 |
The bike featured a single cylinder engine, 21" front and 18" rear wheels and a large fuel tank as standard. It experienced a number of minor changes over its lifespan.
Models
editIn 1997 KTM introduced the 620 Adventure with a 609 cc engine. The bike received a new 625 cc engine for the 1998 model year and was renamed the 640 Adventure-R.
For model year 2004 it experienced noticeable changes with a low front fender, twin front brake discs and the primary color changing from silver to orange.
Production ceased at the end of the 2007 model year after no further displacement changes.