11-52E
Engine 640 LC4
Design Liquid-cooled single cylinder 4-stroke engine with balancer shaft and electric starter
Displacement 625 ccm
Bore / Stroke 101 / 78 mm
Ratio 11.5 : 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 584-V03/1
Valve diameter Intake: 36 mm Exhaust: 32 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/cast aluminium alloy
Piston rings 1 compression ring, 1 taper face ring, 1 oil scraper ring
Engine lubrication two Eaton-oilpumps
Engine oil SAE 5W/40, 10W-50 (f.ex. Motorex Power Synt 4T)
Engine oil quantity appr. 2,1 liters including frame
Primary ratio straight geared spur wheels 31 : 79 teeth
Clutch multi disc clutch in oil bath, hydraulically operated
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 4K5
Ignition timing adjustment to max. 38° BTDC at 6000 rpm
Generator 12V 200W
Spark plug NGK DCPR 8 E
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
TECHNICAL DATA – ENGINE 640 LC4, 640 LC4 Supermoto 2003
BASIC CARBURETOR SETTING
Type BST40-266
Main jet 152,5
Needle jet X-6 689
Idling jet 45
Jet needle 6G5
Needle clip pos. f. top 3. from top
Mixt. adj. screw open 2,25
640 LC4
640 LC4 Supermoto
BASIC CARBURETOR SETTING
Carburetor BST40-258
Main jet 145
Needle jet 689 X-6
Idling jet 45
Jet needle 6G5
Needle position from top 3 rd
Mixture.adju. screw open 2.25 turn
640 DUKE
40 kW
BASIC CARBURETOR SETTING
Type BST40-266
Main jet 152,5
Needle jet X-6 689
Idling jet 45
Jet needle 6G5
Needle clip pos. f. top 3. from top
Mixt. adj. screw open 2,25
640 LC4 Adventure
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