11-22E
TECHNICAL DATA – ENGINE 640 LC4-E ADVENTURE R ‘99
Engine 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 clearance IC 51° ABDC EC 11° ATDC
Valve diameter Intake: 36 mm Exhaust: 30 mm
Valve clearance cold 0,15 mm Exhaust: 0,15 mm
Crank shaft bearing 2 cylinder roller bearing
Conrod 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 two Eaten-oilpumps
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
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 and kickstarter
BASIC CARBURETOR SETTING
Carburetor BST40-225 BST40-225
Carburetor setting number 080298 090298
Main jet 142,5 142,5
Needle jet 689 X-6 689 X-6
Idling jet 45 45
Jet needle 6G5 6G5
Needle position from top 3
rd
3
rd
Mixt. adj. screw open – –
Throttle valve – –
Starting jet – –
Permormance restrictor
slide stop 17 mm –
640 ADVENTURE
36 kW
640 ADVENTURE
25 kW
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