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
ManufacturerKTM
Production1998-2007
SuccessorKTM 690 Enduro
ClassDual-sport
Engine620 cc (38 cu in) single cylinder, 4-stroke, Mikuni BST40, Pressure oil lubrication
Bore / stroke101 mm × 78 mm (4.0 in × 3.1 in)
Compression ratio11.7:1
Power54 hp (40 kW)/7000rpm
Torque55 N⋅m (41 lbf⋅ft)/5500 rpm
Ignition typeKokusan DC-CDI
Transmission5 gears, dog clutch engagement
Frame typeChromium-molybdenum, power-coated
SuspensionFront: WP USD 48mm fork, Rear: WP monoshock with Pro Lever Linkage
BrakesFront: Dual 320 mm disc (from 2004);
Rear: Brembo 1-piston floating caliper, 220 mm disc
TiresFront: 90/90-21";
Rear: 140/80-18"
Rake, trail62.5°
Wheelbase1,510 mm (59 in) ±10mm
Seat height945 mm (37.2 in)
Weight158 kg (348 lb) (dry)
Fuel capacity25.5 L (5.6 imp gal; 6.7 US gal),
3.5 L (0.77 imp gal; 0.92 US gal) reserve
RelatedDuke 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

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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.

References

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