KTM 640 LC4 Adventure (2004 - 2005)

The KTM 640 LC4 Adventure is a masterclass in motorcycle design, distilling the essence of versatility, agility, and power into a lightweight and agile package. The 625cc single-cylinder engine, a proven performer in KTM’s lineup, provides effortless acceleration and a reassuring throttle response, perfectly suited for trail riding.

With a riding position tailored for medium-sized riders, the 640 Adventure offers a perfect blend of comfort and control. The deep exhaust note serves as a constant reminder of the engine’s revs, while the clutch and gear shifts are precise and fatigue-free.

On the trails, the 640 Adventure’s 52 horsepower and 55 Nm of torque prove more than capable of tackling even the most demanding off-road terrain, from steep hills to river crossings. Suspension travel is generous, courtesy of the WP units, which effortlessly absorb even the most extreme bumps and jumps.

This bike is a true off-road enthusiast’s dream, capable of handling anything the trail throws at it with confidence and poise. Whether you’re a seasoned pro or just starting out, the KTM 640 LC4 Adventure is a must-ride experience that will leave you grinning from ear to ear.

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	7.4 US gallons / 28.0 L
Seat Height	37.2 inches / 945 mm

*n/a – information not provided by manufacturer

All Specifications

Make & Model

Model	KTM 640 LC4 Adventure
Year	2004 – 2005

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	2X 300mm sisc
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	7.4 US gallons / 28.0 L
Dry Weight	158.0 kg / 348.3 lbs

Features

625cc single-cylinder four-stroke engine
LC4 engine with successful track record on other KTM models
Perfect riding position for medium-sized riders
Deep exhaust note making rider aware of RPM levels
Clutch feel is firm and precise
Throttle response tuned for trail riding, smooth and reassuring
Powerful engine for off-road riding, climbing steep hills and passing rivers
Torquey engine with 55Nm at 5500rpm
WP front and rear suspension units suitable for off-road riding
Good performing front brake with trick to use on wet grass surface
Performance Brembo brakes with 300mm discs on front and 220mm disc on rear
Efficient and confident braking performance on normal street use
Evolution of vibration levels through handlebars and footpegs
Acceptable and easy-to-live-with vibration levels
Wonderful mix of power, versatility, and fun
52 horsepower at 7000rpm

*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