Technical Data - Engine - KTM 400 EXC Owner's Manual

TECHNICAL DATA – ENGINE
ENGINE
Design
Displacement
Bore/Stroke
Ratio
Fuel
Valve timing
Camshaft
Valve diameter Intake
Valve diameter Exhaust
Valve clearence cold Intake
Valve clearence cold Exhaust 0.12 - 0.22 mm (0.005 - 0.009 in)
Crank shaft bearing
Connecting rod bearing
Top end bearing
Piston
Piston rings
Engine lubrication
54
Engine oil
Quantity of engine oil
Primary drive
Transmission claw shifted
1st gear
2nd gear
3rd gear
4th gear
5th gear
6th gear
Ignition system
Generator
Spark plug
Cooling system
Cooling liquid
JASO T903 MA
TEMPERATUR
5W/40
»
250 SX-F
Liquid-cooled single cylinder 4-stroke engine
249.51 ccm
76 / 55 mm
12.8 : 1
unleaded fuel with at least RON 95
4 valves controlled by finger levers and 2 camshafts,
driven by a pair of spur gears and a tooth-type chain
05
30.9 mm
26.5 mm
0.10 - 0.20 mm (0.004 - 0.008 in)
2 cylinder roller bearings
needle bearing
bronze bushing
alluminium alloy forged
1 compression ring, 1 oil scraper ring
pressure circulation lubrication with 2 rotor pumps
full synthetic oil (Motorex Power Synt 4T 10W/50)
1.1 liters
22:68
6-speed
13:32
15:30
17:28
19:26
21:25
22:24
contactless DC-CDI ignition with digital advanced system by KOKUSAN
no generator
NGK CR 9 EBK
liquid cooled, permanent rotation of cooling liquid through mechanically driven water pump
1.2 liters, 50% antifreeze, 50% destilled water, at least -25° (-13° F)
0°C
32°F
10W/50
Engine oil
Only use fully synthetic engine oils that meet the JASO MA quality require-
ments (see information on the can).
KTM recommends Motorex Power Synt 4T in the 10W/50 viscosity (for tem-
peratures over 0°C, 32°F) or 5W/40 (for temperatures under 0°C, 32°F).
POOR OIL QUALITY OR MINOR QUANTITY CAUSE EARLY ENGINE-WEAR.