ENGLISH
37
Engine 620
Design Liquid-cooled single cylinder 4-stroke engine with balancer shaft
Displacement 609 ccm
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 diameter Intake: 36 mm Exhaust: 30 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
Piston rings 1 compression ring, 1 taper face ring, 1 oil scraper ring
Engine lubrication forced-feed lubrication through Eaton-Oilpump with oil sump
Engine oil see table
Engine oil quantity 1,6 liters (0,42 US gallons)
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 KOKUSAN 4K3
Ignition timing adjustment to max. 36 ° BTDC at 5000 rpm
Generator 12V 110W
Spark plug NGK DPR8 EA-9
Spark plug gap 0,9 mm
Cooling system liquid cooled, permanent rotation of cooling liquid through mechanic driven water pump
Cooling liquid 1liter, 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 SC, 620 SC SUPERMOTO
2001
620 SC,
620 SC SUPERMOTO
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
080600
155
DR 266
45
K 51
3 rd
1,5 turns
40
45
Slide stop 24mm
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