KTM 640 Adventure

The KTM 640 Adventure is a dual-sport motorcycle made by KTM from model years 1998 until 2007.

KTM 640 Adventure

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

In 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.