KTM 400-660 LC4 1998-2005 User Manual

11-46E
TECHNICAL DATA – ENGINE 640 LC4 2002
Engine 640 LC4
Design Liquid-cooled single cylinder 4-stroke engine with balancer shaft and electric starter
Displacement 624,6 ccm
Bore / Stroke 101 / 78 mm
Ratio 11 : 1
Fuel unleaded premium gasoline with a least RON 95
Valve timing 4 valves over rocker arm and 1 overhead camshaft, camshaft drive through single chain
Camshaft 249/1
Valve diameter Intake: 36 mm Exhaust: 30 mm
Valve clearence cold 0,15 mm Exhaust: 0,15 mm
Crank shaft bearing 2 cylinder roller bearing
Connecting rod bearing needle bearing
Top end bearing bronze bushing
Piston forged aluminium alloy
Piston rings 1 compression ring, 1 taper face ring, 1 oil scraper ring
Engine lubrication two oilpumps
Engine oil 10W-40 (Shell Advance Ultra 4)
Engine oil quantity appr. 2,1 liters including frame
Primary ratio straight geared spur wheels 30 : 81 teeth
Clutch multi disc clutch in oil bath
Transmission 5-speed claw shifted
Gear ratio 1st 14:35
2nd 15:24
3rd 18:21
4th 20:19
5th 22:18
Ignition system contactless DC-CDI ignition with digital advanced system type KOKUSAN 4K-2
Ignition timing adjustment to max. 38° BTDC at 6000 rpm
Generator 12V 200W
Spark plug NGK DPR8 EA9
Spark plug gap 0,9 mm
Cooling system liquid cooled, permanent rotation of cooling liquid through mechanic driven water pump
Cooling liquid 1 liter, 40% antifreeze, 60% water, at least –25 ° C (–13 ° F)
Starting equipment electric starter and kickstarter
640 LC4, SUPERMOTO
640 LC4 ADVENTURE
BASIC CARBURETOR SETTING
Type
Carb.-setting number
Main jet
Needle jet
Idling jet
Jet needle
Needle clip pos. f. top
Mixt. adj. screw open
BST40-225
090298
142,5
689 X-6
45
6G5
3.
2,25
640 DUKE
40 kW
BST40-225
100299
145
689 X-6
45
6G5
3.
2,25

KTM 400-660 LC4 1998-2005 Specifications

General

Brand	KTM
Model	400-660 LC4 1998-2005
Category	Engine
Language	English