KTM LC4 Supercomp (1999)

The KTM 640 LC4 Supercomp is a motorcycle model from 1999 that has a four stroke, single cylinder engine with a 624.6 cc capacity and a compression ratio of 11.5:1. It features liquid cooling and a Mikuni BST 40 carburetor. The ignition is a Kokusan contactless DC-CDI with an advanced system and it has both electric and kick start options. The maximum power output is 40.1 kW at 7000 rpm and the maximum torque is 55 Nm at 5500 rpm. The clutch is multi-disc and the transmission has five speeds. The frame is made of central chrome-moly steel and it has a White Power Up Side Down 4357 MXMA fork front suspension with 275 mm wheel travel and a central shock absorber rear suspension with PRO-LEVER linkage and 300 mm wheel travel. The brakes are single disc, with a 4 piston caliper at the front and 1 piston caliper at the rear. The front wheel has a 90/90-21 tire and the rear wheel has a 130/80-18 tire. The wheelbase is 1510 mm, seat height 925 mm, dry weight 149 kg, and fuel capacity is 11 L.

---

Technical specifications:

Make Model: KTM 640 LC4 Supercomp

Year: 1999

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: 275 mm / 10.8 in

Rear Suspension: Central shock absorber (WP BAVP3612) with PRO-LEVER linkage to rear- swing-arm with needle bearing

Rear Wheel Travel: 300 mm / 11.8 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: 130/80 – 18

Steering Head Angle: 62o

Wheelbase: 1510 mm / 59.4 in

Ground Clearance: 310mm / 12.2 in

Seat Height: 925 mm / 36.4 in

Dry Weight: 149 kg / 328 lbs

GVWR: 350 / 773 lbs

Engine Oil Capacity: 2.1 L / 2.2 US qt / 1.8 Imp qt

Fuel Capacity: 11 L / 2.9 US gal / 2.3 Imp gal