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
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