BASIC CARBURETOR SETTING
Carburetor
Carburetor setting number
Main jet
Needle jet
Idling jet
Jet needle
Needle position from top
Mixture.adju. screw open
Throttle valve
Starting jet
Performance restrictor
PHM 40 SD
110996
155
DR 268
45
K 51
3 rd
1,5 turn
40
45
slide stop 26 mm
PHM 40 SD
110996
155
DR 268
45
K 51
3 rd
1,5 turn
40
45
–
620 LC4 COMP.
24 kW
620 LC4 COMP.
37 kW
11-18E
Engine
620 LC4 COMPETITION
Design
Liquid-cooled single cylinder 4-stroke engine with balancer shaft
Displacement
609 cm
3
Bore / Stroke
101 / 76 mm
Ratio
10,4 : 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 timing by 1 mm
IO 15° BTDC EO 52° BBDC
valve clearance
IC 54° ABDC EC 17° ATDC
Valve diameter
Intake: 36 mm Exhaust: 30 mm
Valve clearance cold
Intake: 0,15 mm Exhaust: 0,15 mm
Crankshaft 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
forced-feed lubrication through 2 Eaten-oilpumps
Engine oil quantity
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 thyristor ignition with electronic advanced system type SEM
Ignition timing
adjustment to max. 32 ° BTDC at 6000 rpm
Generator
12V 130W
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
decompressor automatic and hand actuated, cold and hot start knob on carburetor
TECHNICAL SPECIFICATIONS – ENGINE 620 LC4 COMPETITION ‘99
Содержание 400-660 LC4 1998-2005
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