ENGLISH
41
Engine oil
Use only synthetic oil brands (Motorex Power Synt
4T), that meet quality requirements of API-classes SG
or SH (information on bottles) or higher.
!
CAUTION
!
P
OOR OIL QUALITY OR LOW QUANTITY CAUSE EARLY ENGINE
WEAR
.
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
#
–
+
0°C
32°F
15W 40
15W 50
10W 40
10W 50
API: SG, SH
TEMPERATURE
TECHNICAL DATA – ENGINE 640 DUKE II 2003
Type
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
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
forged aluminium alloy
Piston rings
1 compression ring, 1 taper face ring, 1 oil scraper ring
Engine lubrication
2 Eaton-Oilpumps
Quantity of engine oil
see table
Engine oil
2.1 liters including frame
Primary ratio
straight geared spur wheels 31 : 79 teeth
Clutch
multi-disc clutch in oil bath
Transmission
5-speed claw shifted
Gear ratio
1st 14:35
2nd 15:24
3nd 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 DCPR 8E
Spark plug gap
0.9 mm
Cooling system
liquid cooled, permanent rotation of cooling liquid through mechanically driven water pump
Cooling liquid
1 liter, 40% antifreeze, 60% water, at least –25° C (–13° F)
Starting equipment
electric starter, kick starter