ENGLISH
40
Engine 400 LC4 620 LC4
Design Liquid-cooled single cylinder 4-stroke engine with balancer shaft
Displacement 398 cm
3
609 cm
3
Bore / Stroke 89 / 64 mm 101 / 76 mm
Ratio 10,8 : 1 SX: 11,5 : 1 SC, EGS: 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° (249)
Valve timing by 1 mm IO 22° BTDC EO 59° BBDC IO 14° BTDC EO 56° BBDC
valve clearence IC 47° ABDC EC 10° ATDC IC 55° ABDC EC 13° ATDC
Valve diameter Intake: 36 mm Exhaust: 30 mm
Valve clearence cold Intake: 0,20 mm Exhaust: 0,20 mm 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/cast aluminium alloy
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 bellow #
Engine oil quantity SX, : 1,45 liters / SC, EGS: 1,6 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. 38 ° BTDC at 6000 rpm SX: adjustment to max. 38 ° BTDC at 6000 rpm
SC, EGS: adjustment to max. 32 ° BTDC at 6000 rpm
Generator 12V 130W
Spark plug NGK D8EA
Spark plug gap 0,6 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 400/620 SX, SC, EGS ‘98
Hexagon nut at primary gear M20x1,5 Loctite 242 + 170Nm (125 ft.lb)
Collar nut flywheel M12x1 LH thread 60 Nm (44 ft.lb)
Hexagon nut for inner clutch hub M18x1,5 Loctite 648 + 80 Nm (59 ft.lb)
Kickstarter stop screw M12x1,5 70 Nm (52 ft.lb)
AH screws oil pump M6 Loctite 242 + 8 Nm (6 ft.lb)
Hexagon screw camshaft gear M10 35 Nm (26 ft.lb)
AH screw cylinder head top sect. M6x25 8 Nm (6 ft.lb)
AH screw cylinder head top sect. M6x50/M6x55 (12.9) 20 Nm (15 ft.lb)
AH screw cylinder head top sect. M6x65/M6x70 (8.8) 8 Nm (6 ft.lb)
Cylinder head screws M10 50 Nm (37 ft.lb)
Collar nuts at cylinder base M10 40 Nm (30 ft.lb)
Hexagon screw chain sprocket M10 Loctite 242 + 40 Nm (30 ft.lb)
Oil drain plug M22x1,5 30 Nm (22 ft.lb)
Magnetic plug M12x1,5 20 Nm (15 ft.lb)
Plug bypass valve M12x1,5 20 Nm (15 ft.lb)
Banjo bolts oil lines M8x1 10 Nm (7 ft.lb)
Banjo bolt oil lines M10x1 15 Nm (11 ft.lb)
Jet screw clutch cover M8x1 10 Nm (7 ft.lb)
Screw plug timing-chain tensioner M12x1,5 20 Nm (15 ft.lb)
Counternuts valve adjusting screws M7x0,75 20 Nm (15 ft.lb)
TIGHTENING TORQUES - ENGINE
Crank shaft axial play .............................................0,03 - 0,12 mm
(0,001-0,005 in)
run out of crank stud.............................max. 0,04 mm (0,0016 in)
Connecting rod bearing
radial play .............................................max. 0,05 mm (0,0019 in)
axial play...............................................max. 1,00 mm (0,04 in)
Piston assembly clearance 400/620.................max. 0,12 mm (0,005 in)
Piston rings end gap compression rings..................................max. 0,60 mm (0,023 in)
oil scraper ring.......................................max. 0,80 mm (0,031 in)
Valves seat sealing intake..................................max. 1,50 mm 0,059 in)
seat sealing exhaust...............................max. 2,00 mm (0,079 in)
run out of valve heads ...........................max. 0,03 mm (0,001 in)
valve guides diameter............................max. 7,05 mm (0,277 in)
Oil pump clearance outer rotor - housing...............max. 0,20 mm (0,008 in)
clearance outer rotor - inner rotor..........max. 0,20 mm (0,008 in)
Bypaß valve minimum spring lenght.....................................25 mm (1 in)
Clutch discs wear limit organic............................................2,5 mm (0,1 in)
Transmission shafts axial play .................................................0,1 - 0,4 mm (0,004 in)
Clutch
minimum clutchspring lenght................
34,5 mm (new 37 mm) (1,36 in - new 1,45 in)
TOLERANCE, ASSEMBLY CLEARANCE
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