Adventure Motorcycles
2003KTM 640 LC4 Adventure
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The 2003 KTM 640 LC4 Adventure is a capable single-cylinder enduro bike built for serious off-road exploration and adventure touring. Its torquey 625cc liquid-cooled engine delivers strong low-end power ideal for technical terrain and long-distance travel. Best known for reliability and versatility, it suits riders seeking genuine dual-sport capability with minimal road-biased compromise.
- Capacity
- 625.0 ccm
- Engine
- Single
- Gearbox
- 5-speed
- Dry weight
- 158.0 kg
- Seat height
- 945 mm
- Power
- 54.8 HP (40.3 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- A big-bore dual-sport built for long-distance off-road adventure riding and rugged terrain exploration with light touring capability.
- Built for
- A torquey, characterful thumper that rewards riders who enjoy raw mechanical feel over refinement and outright speed.
- Not ideal for
- Not ideal for shorter riders, pure pavement commuters, or anyone seeking smooth multi-cylinder refinement and high top-end power.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usEngine
- Capacity
- 625.0 ccm
- Power
- 54.8 HP (40.3 kW)
- Torque
- 55.0 Nm (5.6 kgf-m)
- Engine type
- Single
- Power/weight ratio
- 0.3468 HP/kg (dry)
- Bore x stroke
- 101.0 x 78.0 mm
- Compression
- 11.5:1
- Cooling system
- Liquid
- Fuel system
- Carburettor
- Starting
- Electric & kick
- Ignition
- Kokusan DC-CDI
- Valves per cylinder
- 4
- Lubrication system
- Pressure lubrication with 2 Eaton pumps
Transmission
- Gearbox
- 5-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Wet multi-disc clutch, operated hydraulically
Dimensions & weight
- Wheelbase
- 1510 mm
- Overall width
- 640 mm
- Seat height
- 945 mm
- Dry weight
- 158.0 kg
- Fuel capacity
- 28.00 litres
- Ground clearance
- 315 mm
- Reserve fuel capacity
- 3.50 litres
Chassis & suspension
- Frame
- chromium-molybdenum, power-coated
- Front suspension
- WP-USD 43 MA
- Rear suspension
- WP - Monoshock
- Front wheel travel
- 270 mm
- Rear wheel travel
- 320 mm
- Rake (fork angle)
- 27.5°
- Trail
- 124 mm
Brakes & wheels
- Front brakes
- Single disc
- Front brakes diameter
- 320 mm
- Rear brakes
- Single disc
- Rear brakes diameter
- 220 mm
- Front tyre
- 90/90-21
- Rear tyre
- 140/80-18
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 2003 | 2004 | 2005 |
|---|---|---|---|
| Capacity | 625 cc | 625 cc | 625 cc |
| Dry weight | 158 kg | 158 kg | 158 kg |
| Seat height | 945 mm | 945 mm | 945 mm |
| Fuel capacity | 28 L | 28 L | 25.5 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the KTM 640 LC4 Adventure?
The 2003 KTM 640 LC4 Adventure has a Capacity of 625.0 ccm (38.14 cubic inches).
What engine power does the KTM 640 LC4 Adventure have?
The 2003 KTM 640 LC4 Adventure has a Power of 54.8 HP (40.3 kW).
How many gears does the KTM 640 LC4 Adventure have?
The 2003 KTM 640 LC4 Adventure has a Gearbox of 5-speed.
What is the torque of the KTM 640 LC4 Adventure?
The 2003 KTM 640 LC4 Adventure has a Torque of 55.0 Nm (5.6 kgf-m or 40.6 ft.lbs).
How much does the KTM 640 LC4 Adventure weigh?
The 2003 KTM 640 LC4 Adventure has a Dry weight of 158.0 kg (348.3 pounds).
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