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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
