Manual KTM 250 SX (page 121 of 153) (English)

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9-37C

Repair manual KTM 250 / 300 / 380 Art No 3206004 -E

Engine 250 MXC/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 297 ccm

Bore / stroke 66,4 / 72 mm (2.62 / 2.84 in) 72 / 73 mm (2.84 / 2.88 in)

Fuel unleaded SUPER fuel, research octane no 95, mixed with high-grade, two- stroke oil

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 forged piston

Piston ring two plain compression rings

Dimension “X“

0 + 0,1 mm (0 + 0.004 in)

Ingition timing 1,9 mm vor OT 1,94 mm vor OT

Spark plug NGK BR 7 ES

Electrode gap 0,60 mm

Dimension “Z“

49,5 mm (0.024 in) 46 mm (1.7 in)

TVC start open 5000/min 5900/min

TVC fully open 7000/min 7750/min

Primary drive straight cut spur gears, primary ratio 25:72

Clutch multiple disc clutch in oil bath, hydraulically operated (Shell HF-E15

Transmission 5 speed, claw actuated

Gear ratio EXC MXC EXC MXC

gear 15:29 15:29 15:29 15:29

gear 18:26 17:27 18:26 18:26

gear 19:22 19:25 19:22 19:24

gear 21:20 21:23 21:20 21:23

gear 23:18 23:21 23:18 23:21

Gear lubrication 0,8 l engine oil 10W-40

ailable chain sprockets 13Z / 14Z / 15Z for chain

Coolant 1.3 liters, 40% antifreeze, 60% water, at least -25 °C (-13 °F)

Ignition system 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 MXC / EXC 2003

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KTM 250 SX Manual

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