11-9E
Repair manual KTM LC4 Art.-Nr. 3.206.014 -E
TECHNICAL DATA – ENGINE 400 / 640 LC4 ‘98
Engine 400 LC4 640 LC4
Design Liquid-cooled single cylinder 4-stroke engine with balancer shaft and electric starter
Displacement 398 ccm 624.6 ccm
Bore / Stroke 89 / 64 mm 101 / 78 mm
Ratio 10,8 : 1 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° (249/1)
Valve timing by 1 mm IO 22° BTDC EO 60° BBDC IO 13° BTDC EO 53° BBDC
valve clearence IC 47° ABDC EC 4° ATDC IC 51° ABDC EC 11° ATDC
Valve diameter Intake: 36 mm Exhaust: 30 mm
Valve clearence cold Intake: 0,20 mm Exhaust: 0,20 mm 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 two Eaten-oilpumps
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
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 DR8EA
Spark plug gap 0,7 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
for chain
5
/
8
x
1
/
4
"
15
16
17
38
40
42
45
48
for chain
5
/
8
x
1
/
4
"
30:81
Primary
ratio
Transmission
Available chain
drive sprockets
Available final
drive sprockets
GEAR RATIOS
1st gear 14:35
2nd gear 15:24
3rd gear 18:21
4th gear 20:19
5th gear 22:18
Original final
drive ratio
15:45
16:40
16:42
17:38
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