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TECHNICAL SPECIFICATIONS – ENGINE
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ENGINE 625 SXC / SMC
Design Liquid-cooled single cylinder 4-stroke engine with balancer shaft
Displacement 625 cm
3
Bore / Stroke 101 / 78 mm (3.97 / 3.07 in)
Ratio 11.7 : 1
Fuel unleaded fuel with at least RON 95 (USA = Premium RON 91)
Valve timing 4 valves over rocker arm and 1 overhead camshaft, camshaft drive through single chain
Camshaft 249/1
Valve diameter Intake: 36 mm (1.41 in) Exhaust: 32 mm (1.26)
Valve clearence cold Intake: 0.12 - 0.15 mm Exhaust: 0.12 - 0.15 mm
Crank shaft bearing 2 cylinder roller bearing
Connecting rod bearing needle bearing
Top end bearing bronze bushing
Piston forged aluminium alloy
Piston rings 1 compression ring, 1 taper face ring, 1 oil scraper ring
Engine lubrication two Eaton-oilpumps
Engine oil see table #
Engine oil quantity appr. 2.1 liters including frame
Primary ratio straight geared spur wheels 31 : 79 teeth
Clutch multi disc clutch in oil bath
Transmission 5-speed claw shifted
Gear ratio
1
st
14:35
2
nd
15:24
3
rd
18:21
4
th
20:19
5
th
22:18
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 DCPR 8E
Spark plug gap 0.9 mm
Cooling system liquid cooled, permanent rotation of cooling liquid through mechanic driven water pump
Cooling liquid 1 liter, 50% antifreeze, 50% distilled water, at least –25°C (–13°F)
Starting equipment kick - electric starter
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 temperatures 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.
#
0°C
32°F
10W/50
5W/40
JASO T903 MA
TEMPERATUR
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