11-24E
TECHNICAL DATA – ENGINE KTM 640 DUKE ‘99
Type
640 LC4-E
Design
Liquid-cooled single cylinder 4-stroke engine with balancer shaft and electric starter
Displacement
625 ccm
Bore / Stroke
101 / 78 mm
Ratio
11,0 : 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° (249/1)
Valve timing by 1 mm
IO 13° BTDC EO 53° BBDC
valve clearence
IC 53° ABDC EC 11° ATDC
Valve diameter
Intake: 36 mm Exhaust: 30 mm
Valve clearence cold
Intake: 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
cast aluminium alloy
Piston rings
1 compression ring, 1 taper face ring, 1 oil scraper ring
Engine lubrication
2 Eaton-Oilpumps
Engine oil
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
Ignition timing
adjustment to max. 38° BTDC at 6000 rpm
Generator
12V 200W
Spark plug
NGK DPR8 EA-9
Spark plug gap
0.90 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, kick starter
BASIC CARBURETOR SETTING
Carburetor
Carburetor setting number
Main jet
Needle jet
Idling jet
Jet needle
Needle position from top
Mixture.adju. screw open
BST40-225
100299
145
689 X-6
45
6G5
3 rd
2,25 turn
640 DUKE
40 kW
Summary of Contents for 400-660 LC4 1998-2005
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Page 167: ...Repair manual KTM LC4 Art Nr 3 206 014 E 8 3E CARBURETOR MIKUNI BST 40...
Page 175: ...Repair manual KTM LC4 Art Nr 3 206 014 E 8 11E CARBURETOR DELL ORTO PHM 40 SD...
Page 179: ...Repair manual KTM LC4 Art Nr 3 206 014 E 8 15E CARBURETOR DELL ORTO PHM 38 ND...
Page 184: ...8 20E CARBURETOR DELL ORTO VHSB 38 QS...
Page 191: ...Repair manual KTM LC4 Art Nr 3 206 014 E 8 27E CARBURATOR KEIHIN FCR 41...
Page 203: ...8 39E Repair manual KTM LC4 Art Nr 3 206 014 E CARBURETOR KEIHIN FCR MX 41...
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Page 402: ...13 35E 400 640 LC4 USA...
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Page 405: ...Repair manual KTM LC4 Art Nr 3 206 014 E 13 38E KTM 620 SC 2001...
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Page 413: ...Repair manual KTM LC4 Art Nr 3 206 014 E 13 46E KTM 640 LC4 E 2001...
Page 414: ...13 47E 625 SuperComp 2002 SERVICE...
Page 415: ...Repair manual KTM LC4 Art Nr 3 206 014 E 13 48E KTM 625 SUPER COMPETITION 2002...
Page 416: ...13 49E SERVICE 640 LC4 ADVENTURE...
Page 417: ...Repair manual KTM LC4 Art Nr 3 206 014 E 13 50E KTM 640 LC4 ADVENTURE 2002...
Page 418: ...13 51E SERVICE DUKE 2002...
Page 419: ...Repair manual KTM LC4 Art Nr 3 206 014 E 13 52E KTM DUKE 2002...
Page 424: ...13 57E 660 SMC 2003...
Page 425: ...13 58E Repair manual KTM LC4 Art Nr 3 206 014 E KTM 660 SMC 2003...
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