KTM 640 LC4 Enduro (2003-04)

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The KTM 640 LC4 Enduro was produced between 2003-04 and is a four-stroke, single-cylinder motorcycle with a capacity of 624.6 cc. It has a compression ratio of 11.5:1, uses liquid cooling, and has a Mikuni BST 40 carburetor for induction. With a Kokusan contactless DC-CDI ignition, the bike can be started electrically or via a kick. The maximum power output of this bike is 40.1 kW/55 hp at 7000 rpm while the maximum torque is 55 Nm / 5.6 kgf-m / 40.6 lb-ft at 5500 rpm. It has 5-speed transmission and a chain final drive. The bike features a central chrome-moly steel frame, White Power Up Side Down 4357 MXMA fork front suspension with a front wheel travel of 280 mm, and a central shock absorber (WP BAVP3612) with PRO-LEVER linkage to rear-swing arm with needle bearing rear suspension, with a rear wheel travel of 320 mm. Braking is handled by single 300mm and 220mm disc brakes, with a 90/90-21 front tire and 140/80-18 rear tire. It has a ground clearance of 310mm and a seat height of 930 mm. The wet weight is 158 kg with a fuel capacity of 12 L and average consumption of 4.7 seconds. The top speed is 168 km/h or 104 mph.

Technical specifications:

Make Model: KTM 640 LC4 Enduro

Year: 2003 – 04


Engine: Four stroke, single Cylinder. SOHC, 4 valves, engine balancer
Capacity: 624.6 cc / 38.1 cu in
Bore x Stroke: 101 x 78 mm
Compression Ratio: 11.5:1
Cooling System: Liquid cooled
Lubrication: 2 x Eaten oil pumps
Induction: Mikuni BST 40 carburetor
Ignition: Kokusan contactless DC-CDI ignition with advanced system
Starting: Electric & kick
Spark Plug: NGK DRBEACPR 8 E
Battery: 12V 8Ah, maintenance free
Max Power: 40.1 kW / 55 hp @ 7000 rpm
Max Torque: 55 Nm / 5.6 kgf-m / 40.6 lb-ft @ 5500 rpm
Clutch: Multi-disc in oil bath
Transmission: 5 Speed

Primary Drive Ratio: 30:81, straight cut gears
Gear Ratios: 1st 14:35 / 2nd 15:24 / 3rd 18:21 / 4th 20:19 / 5th 22:18
Final Drive Ratio: 17:38
Final Drive: Chain, O-ring 5/8 x 1/4″
Frame: Central chrome-moly steel frame
Front Suspension: White Power Up Side Down 4357 MXMA fork
Front Wheel Travel: 280 mm / 11.0 in
Rear Suspension: Central shock absorber (WP BAVP3612) with PRO-LEVER linkage to rear- swing-arm with needle bearing
Rear Wheel Travel: 320 mm / 12.6 in
Front Brakes: Single 300 mm disc, 4 piston caliper
Rear Brakes: Single 220 mm disc, 1 piston caliper
Front Tyre: 90/90 – 21
Rear Tyre: 140/80 – 18
Steering Head Angle: 62o
Wheelbase: 1510 mm / 59.4 in
Ground Clearance: 310mm / 12.2 in
Seat Height: 930 mm / 36.6 in
Wet Weight: 158 kg / 348 lbs
GVWR: 350 / 773 lbs
Engine Oil Capacity: 2.1 L / 2.2 US qt / 1.8 Imp qt

Fuel Capacity: 12 L / 3.2 US gal / 2.6 Imp gal
Consumption Average: 4.7 sec
Top Speed: 168 km/h / 104 mph

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