Engine 400 LC4-E
Design Liquid-cooled, 1-cylinder, 4-stroke Otto engine with balancer shaft and electric starter
Displacement 398 cm
3
Bore/Stroke 89 / 64 mm
Compression ratio 10.3:1
Fuel unleaded premium fuel with at least ROZ 91
Steering 4 valves controlled over rocker arm and 1 camshaft, camshaft drive with single chain
Camshaft 279
Valve diameter intake: 36 mm exhaust: 30 mm
Valve clearance, cold intake: 0,20 mm exhaust: 0,20 mm
Crankcase bearing 2 cylinder roller bearing
Conrod bearing needle bearing
Piston pin bearing bronze bush
Piston light alloy - forged
Piston rings 1 compression ring, 1 tapered compression piston ring, 1 oil scraper ring
Engine lubrication 2 Eaton pumps
Engine oil see below #
Quantity of engine oil approx. 2.1 liters incl. frame
Primary drive straight-toothed spur wheels 30:81 Z
Clutch multi-disk clutch in oil bath
Transmission 5-speed constant mesh
Gear ratio 1st gear 14:35
2nd gear 15:24
3rd gear 18:21
4th gear 20:19
5th gear 22:18
Ignition system breakerless transistorized DC - CDI ignition system with digital ignition advance, type KOKUSAN
Ignition point adjustment to max. 37° from TDC at 6000 rpm
Generator 12V 200W
Spark plug NGK DPR 8 EA9
Electrode distance 0.9 mm
Cooling system liquid cooled, permanent circulation of cooling liquid through water pump
Cooling liquid 1 liter, mixing ratio 40% antifreeze, 60% water, at least -25° C
Starting aid electric starter and kickstarter
TECHNICAL SPECIFICATIONS - ENGINE 400 LS-E/MIL 2004
BASIC CARBURETOR SETTING
Type of carburetor BST40-272
Main jet 147,5
Needle jet 689 X-6
Idling jet 45
Jet needle 6G5
Needle position 3rd from top + 1 mm
Mixture control screw open 2.25
400 LC4-E
25 kW
Engine oil
Only use fully synthetic engine oils that meet the
JASO MA quality requirements (see information on
the can).
KTM recommends Motorex Power Synt 4T in the
10W/50 viscosity (for temperatures over 0°C) or
5W/40 (for temperatures under 0°C).
0°C
32°F
10W/50
5W/40
JASO T903 MA
TEMPERATURE
#
45
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