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
Содержание 400-660 LC4 1998-2005
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