Engine 640 Lc4, 640 Lc4 Supermoto 2003 - KTM 400-660 LC4 1998-2005 Repair Manual

11-52E
TECHNICAL DATA – ENGINE 640 LC4, 640 LC4 Supermoto
Engine
Design
Displacement
Bore / Stroke
Ratio
Fuel
Valve timing
Camshaft
Valve diameter
Valve clearence cold
Crank shaft bearing
Connecting rod bearing
Top end bearing
Piston
Piston rings
Engine lubrication
Engine oil
Engine oil quantity
Primary ratio
Clutch
Transmission
Gear ratio
Ignition system
Ignition timing
Generator
Spark plug
Spark plug gap
Cooling system
Cooling liquid
Starting equipment
BASIC CARBURETOR SETTING
Type
Main jet
Needle jet
Idling jet
Jet needle
Needle clip pos. f. top
Mixt. adj. screw open
BASIC CARBURETOR SETTING
Carburetor
Main jet
Needle jet
Idling jet
Jet needle
Needle position from top
Mixture.adju. screw open
Liquid-cooled single cylinder 4-stroke engine with balancer shaft and electric starter
unleaded premium gasoline with a least RON 95
4 valves over rocker arm and 1 overhead camshaft, camshaft drive through single chain
1 compression ring, 1 taper face ring, 1 oil scraper ring
SAE 5W/40, 10W-50 (f.ex. Motorex Power Synt 4T)
multi disc clutch in oil bath, hydraulically operated
contactless DC-CDI ignition with digital advanced system type KOKUSAN 4K5
liquid cooled, permanent rotation of cooling liquid through mechanic driven water pump
1 liter, 40% antifreeze, 60% water, at least –25 ° C (–13 ° F)
640 LC4
640 LC4 Supermoto
BST40-266
152,5
X-6 689
45
6G5
3. from top
2,25
640 DUKE
40 kW
BST40-258
145
689 X-6
45
6G5
3 rd
2.25 turn
640 LC4
625 ccm
101 / 78 mm
11.5 : 1
584-V03/1
Intake: 36 mm Exhaust: 32 mm
0,15 mm Exhaust: 0,15 mm
2 cylinder roller bearing
needle bearing
bronze bushing
forged/cast aluminium alloy
two Eaton-oilpumps
appr. 2,1 liters including frame
straight geared spur wheels 31 : 79 teeth
5-speed claw shifted
1st 14:35
2nd 15:24
3rd 18:21
4th 20:19
5th 22:18
adjustment to max. 38° BTDC at 6000 rpm
12V 200W
NGK DCPR 8 E
0,9 mm
electric starter and kickstarter
BASIC CARBURETOR SETTING
640 LC4 Adventure
Type
Main jet
Needle jet
Idling jet
Jet needle
Needle clip pos. f. top
Mixt. adj. screw open
2003
BST40-266
152,5
X-6 689
45
6G5
3. from top
2,25