KTM 640 LC4 Adventure (2002 - 2003)

The KTM 640 LC4 Adventure is a dual-sport marvel, born from the same DNA as its larger, Paris-Dakar-winning sibling, but stripped of unnecessary bulk and weight.

With its potent LC4 single-cylinder engine, producing a healthy 52 horsepower at 7000 rpm, this bike is ready to tackle anything the off-road throws its way. The 625cc four-stroke motor delivers tractable power, making it perfect for climbing steep hills, navigating rivers, and spreading dirt. Its tuned throttle response, while smooth and reassuring, still packs a punch when needed.

The riding position is perfectly suited for medium-sized riders, and the deep exhaust note keeps the rider informed about the rpms. The clutch feels firm and precise, and the bike’s agility is impressive. Suspension-wise, the WP units front and rear are more than capable of handling the demands of off-road riding.

I had the pleasure of putting the 640 Adventure through its paces, and it truly lived up to its reputation. With its impressive power and agility, this bike is a joy to ride, whether you’re tackling challenging trails or simply exploring the great outdoors.

Key Specifications

Engine Type	Four stroke, single Cylinder. SOHC, 4 Valve per cylinder,
Engine Capacity	624.6 cc / 38.1 cu in
Max Power	35.7 kw / 49 hp
Max Torque	52 Nm / 5.3 kgf-m / 38.4 lb-ft @ 5500 rpm
Fuel Tank Capacity	28 L / 7.4 US gal / 6.2 Imp gal
Seat Height	37.2 inches / 945 mm

*n/a – information not provided by manufacturer

All Specifications

Make & Model

Model	KTM 640 LC4 Adventure
Year	2002 – 2003

Engine

Engine Type	Four stroke, single Cylinder. SOHC, 4 Valve per cylinder,
Displacement	624.6 cc / 38.1 cu in
Bore x Stroke	101 x 78 mm
Compression Ratio	11.0:1
Max Horsepower	35.7 kw / 49 hp
Max Torque	52 Nm / 5.3 kgf-m / 38.4 lb-ft @ 5500 rpm
Engine Management System	Mikuni BST 40
Cooling System	Liquid cooled

Performance

Top Speed

n/a

*n/a – information not provided by manufacturer

Transmission

Clutch	Wet, multiplate
Gearbox	5 Speed, claw shifted
Primary Drive Ratio	30:81
Gear Ratios	1st 14:35 / 2nd 15:24 / 3rd 18:21 / 4th 20:19 / 5th 22:18
Final Drive	Chain

Electrical & Electronics System

Battery	12V 8Ah, maintenance free
Starter	Kick & electric

Chassis & Suspension

Frame Type	Central chrome-moly-steel frame
Front Suspension	50 mm WP upside-down forks
Rear Suspension	WP monoshock
Trail	62.5o

Wheels & Brakes

Front Tire Size	90/90 – 21 54S Enduro 3
Rear Tire Size	140/80 – 18 70R Enduro 3
Front Brakes	Single 300mm disc, 4piston floating caliper
Rear Brakes	Single 220mm disc, 1 piston floating caliper

Dimension & Weights

Seat Height	37.2 inches / 945 mm
Wheelbase	59.4 inches / 1510 mm
Ground Clearance	320 mm / 12.6 in
Fuel Tank Capacity	28 L / 7.4 US gal / 6.2 Imp gal
Dry Weight	154 kg / 340 lbs

Features

Single-cylinder, 4-stroke, 625cc engine
LC4 engine with successful track record on various KTM models
Powerful for off-road use: climbing steep hills, passing rivers, and spreading dirt
52 horsepower at 7000 rpm
55 Nm torque at 5500 rpm
Good tractable power for getting out of trouble
Suitable for trail riding with smooth and reassuring throttle response
WP front and rear suspension suitable for off-road use
Front brake can be tricky to use on wet surfaces, requiring finesse
Performance Brembo brakes with 300mm discs in front and 220mm disc at rear
Efficient and confident braking performance on normal street use
Acceptable and easy-to-live-with vibration levels at high speeds
Rugged and reliable construction for off-road use
Suitable for medium-sized riders with perfect riding position
Deep and reassuring exhaust note providing RPM awareness

*We strive to provide the most comprehensive and accurate specifications possible. However, certain details may not be available if the manufacturer did not disclose them or if the information is no longer publicly accessible. If you find any discrepancy with any data on this site, please feel free to let us know at contact@throttlecraze.com