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KTM 640 LC4 Enduro

Make Model	KTM 640 LC4 Enduro
Year	2001 - 02
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	62^o
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

KTM's LC4 range includes three variations - a Supermoto-styled machine, an enduro spec competition bike and a Paris-Dakar replica desert racer.

All three used the same single-cylinder four-stroke 609cc engine, but the latest versions use the uprated 625cc engine, confusingly called the 640 range. The Enduro follows a similar route to the firm's EXC range, with wire-spoked wheels wearing off-road tyres and a small Brembo front brake disc. The strong power delivery of the single-cylinder engine and the high-quality suspension and brakes is a devastating package in the hands of an experienced rider.

A small fuel tank and constant vibration from the single-cylinder engine means the LC4 is rather impractical on the road.