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Engine 250 SX 250 EXC 300 MXC/EXC
Desgin Liquid-cooled single-cylinder two-stroke engine with KTM Twin Valve Control exhaust system and KTM Torque Chamber
Piston displacement 249 ccm 293,15 ccm
Bore / stroke 66,4 / 72 mm (2.62 / 2.84 in) 72 / 72 mm (2.84 / 2.84 in)
Fuel unleaded fuel with at least RON 95 (USA = Premium RON 91), mixed with high grade two stroke oil (Motorex Cross Power 2T)
Oil / gasolino ratio 1:40 – 1:60 when using high grade, two- stroke oil. When in dout, please contact your importer or use 1:40 mix ratio to be on the safe side
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 rings two plain compression rings
Dimension “X“
0 + 0,1 mm (0 + 0.004 in)
Ingition timing 1,9 mm vor OT
Spark plug NGK BR 8 ECM NGK BR 7 ES
Electrode gap 0,60 mm
Dimension “Z“
48,5 mm (1.9 in) - 0,2 mm (0,008 in)
TVC start open 5200/min
TVC fully open 7000/min (red additional spring), 7500/min (yellow additional spring)
Primary drive straight cut spur gears, primary ratio 26:72
Clutch multiple disc clutch in oil bath, hydraulically operated (Motorex Kupplungs- Fluid 75)
Transmission 5 speed, claw actuated
Gear ratio 250,300 EXC 300 MXC
1
st
gear 14:28 14:30 14:28
2
nd
gear 16:26 17:26 16:26
3
rd
gear 18:24 19:23 18:24
4
th
gear 21:24 20:20 21:24
5
th
gear 22:21 29:23 22:21
Gear lubrication 0,7 l engine oil (Motorex Topspeed 4T 15W50)
ailable chain sprockets 13Z / 14Z / 15Z for chain
5
/
8
x
1
/
4
"
Coolant 1.3 liters, 40% antifreeze, 60% water, at least -25 °C (-13 °F)
Ignition system KOKUSAN 2K-3 KOKUSAN 2K-3
Generator output – 12V 110W
Ignition system USA (MXC) KOKUSAN 2K-2
Generator output 12V 40W
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)
TECHNICAL DATA – ENGINE 250/300 SX, MXC, EXC 2004