KTM 125 SX - Manual (Page 39)

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TECHNICAL SPECIFICATIONS – ENGINE 125/250 SX 2007
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ENGINE 125 SX 250 SX
Design Liquid-cooled, single-cylinder, two-stroke engine with intake and exhaust control
Piston displacement 124,8 cm 3 249 cm 3
Bore / stroke 54 / 54,5 mm 66,4 / 72 mm
Fuel unleaded fuel with at least RON 95 (USA = Premium PON 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).
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 two plain compression rings
Dimension „X“ 0,0 mm 0,0 + 0,1 mm
Ignition timing 1.4 mm (0.055 in) (16.5°) BTDC 1.6 mm (0.063 in) (17°) BTDC
Spark plug NGK BR9 EVX NGK BR8 ECM
Electrode gap 0,60 mm
Dimension „Z“ 43,5 mm (1.68 in) 47 mm (1.85 in)
Exhaust control start open - 5500/min
Exhaust control fully open - 7000/7500/7900/min (red/yellow/green spring)
Primary drive straight cut spur gears
Primary ratio 23 : 73 26 : 72
Available chain sprockets 13t /14t for chain 5/8 x 1/4”
Clutch
multiple disc clutch in oil bath, hydraulically operated
(Motorex hydraulic fluid 75)
Motorex brake fluid DOT 5.1
Transmission 6 speed, claw actuated 5 speed, claw actuated
Gear ratio
1st gear
13 : 32 „1S32“ 14 : 28
2nd gear „2S15“ 15 : 30 „2S30“ 15 : 24
3rd gear „3S17H“ 17 : 28 „3S28H“ 18 : 24
4th gear „4S20H“ 20 : 28 „4S28“ 21 : 24
5th gear „5S19H“ 19 : 23 „5S23“H 22 : 21
6th gear „6S22H“ 22 : 24 „6S24“H
Gear lubrication 0,7 liter Motorex Top Speed 4T 15W50
Available chain sprockets 13Z / 14Z für Kette 5/8 x 1/4"
Coolant
1.2 litres, 40% anti freeze, 60% distilled water, at least -25 °C (-13 °F)
Ignition system KOKUSAN 2K-1 Stator 2K-1/Rotor 2K-2
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)