KTM XC-W 250 SX - Manual (Page 51)

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TECHNICAL SPECIFICATIONS – ENGINE 125 SX, EXC, 200 EXC
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ENGINE 125 SX 125 EXC 200 EXC
Design Liquid-cooled, single-cylinder, two-stroke engine with intake and exhaust control
Piston displacement 124.8 ccm 124.8 ccm 193 ccm
Bore / stroke 54 / 54.5 mm (2.126 / 2.145 in) 54 / 54.5 mm (2.126 / 2.145 in) 64 / 60 mm (2.52 / 2.362 in)
Fuel unleaded fuel with at least RON 95 (USA = Premium RON 91), mixed with high grade two stroke oil
Oil / gasoline ratio 1:40-1:60 when using high grade, two- stroke oil (Motorex Cross Power 2T).
When in doubt, please contact your importer
Crankshaft bearing 1 deep-groove ball bearing / 1 cylinder roller bearing
Connecting rod bearing needle bearing
Piston pin bearing needle bearing
Piston cast piston
Piston ring one plain compression ring two plain compression rings two plain compression rings
Dimension „X“ 0,0 mm
Ignition timing 1.4 mm (0.055 in) (16.5°) BTDC 1.4 mm (0.055 in) (16.5°) BTDC 1.6 mm (0.063 in) (17°) BTDC
Spark plug NGK BR9 EVX NGK BR9 EVX NGK BR 8 EG
Electrode gap 0,60 mm
Dimension „Z“ 43,5 mm (1.68 in) 43,5 mm (1.68 in) 47 mm (1.85 in)
Primary drive straight cut spur gears, primary ratio 23:73
Clutch multiple disc clutch in oil bath, hydraulically operated (Motorex Kupplungs-Fluid 75)
Transmission 6 speed, claw actuated 6 speed, claw actuated 6 speed, claw actuated
Gear ratio
1st gear
13 : 32 „1S32“ 12 : 33 „1G33“ 12 : 33 „1G33“
2nd gear „2S15“ 15 : 30 „2S30“ „2S15“ 15 : 31 „2G31“ „2S15“ 15 : 31 „2G31“
3rd gear „3S17H“ 17 : 28 „3S28H“ „3S17H“ 17 : 28 „3S28H“ „3S17H“ 17 : 28 „3S28H“
4th gear „4S20H“ 20 : 28 „4S28“ „4S19H“ 19 : 26 „4S26“ „4S19H“ 19 : 26 „4S26“
5th gear „5S19“ 19 : 23 „5S23“H „5S21“ 21 : 25 „5S25“ „5G17H“ 17 : 19 „5G19H“
6th gear „6S22“ 22 : 24 „6S24“H „6G20“ 20 : 20 „6G20“ „6G22H“ 22 : 20 „6E20H“
Gear lubrication 0,7 liter Motorex Top Speed 4T 15W50
Available chain sprockets 13t / 14t for chain 5/8 x 1/4"
Coolant 1.2 litres, 50% anti freeze, 50% distilled water, at least -25 °C (-13 °F)
Ignition system KOKUSAN 2K-1 KOKUSAN 2K-3 KOKUSAN 2K-3
Generator output no generator 12V / 110 W 12V / 110 W
Ignition system XC-W – – KOKUSAN 2K-2
Generator output – – 12V 40 W
Carburetor flat-slide carburetor, carburetor setting see table
Air-filter wet foam type air filter insert
(upper edge piston-
upper edge cylinder)
(height of the control flap)