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TECHNICAL DATA – ENGINE
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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 10W/50.
Poor oil quality or minor quantity cause early engine-wear.
ENGINE 250 SX-F, XC-F 250 XCF-W, EXC-F
Design Liquid-cooled single cylinder 4-stroke engine
Displacement 249.51 ccm
Bore/Stroke 76 / 55 mm
Ratio 12.8 : 1
Fuel unleaded fuel with at least RON 95 (USA = Premium PON 91)
Valve timing 4 valves controlled by finger levers and 2 camshafts,
driven by a pair of spur gears and a tooth-type chain
Valve diameter Intake 30.9 mm
Valve diameter Exhaust 26.5 mm
Valve clearence cold Intake 0.10 - 0.15 mm
Valve clearence cold Exhaust
0.12 - 0.17 mm
Crank shaft bearing 2 cylinder roller bearings
Connecting rod bearing needle bearing
Top end bearing bronze bushing
Piston alluminium alloy forged
Piston rings 1 compression ring, 1 oil scraper ring
Engine lubrication pressure circulation lubrication with 2 rotor pumps
Engine oil full synthetic oil (Motorex Power Synt 4T 10W/50)
Quantity of engine oil 1.1 liters
Primary drive 22:68
Clutch multiple disc clutch in oil bath, hydraulically operated (brake fluid DOT 5.1)
Transmission claw shifted 6-speed 6-speed
1st gear 13:32 13:33
2nd gear 15:30 17:33
3rd gear 17:28 19:29
4th gear 19:26 23:28
5th gear 21:25 23:23
6th gear 22:24 26:22
Ignition system contactless DC-CDI ignition with digital advanced system by KOKUSAN
Generator 12 V 80 W at 5000 rpm, SX-F without generator
Spark plug NGK CR 9 EBK
Cooling system liquid cooled, permanent rotation of cooling liquid through mechanically driven water pump
Cooling liquid 1.2 liters, 50% antifreeze, 50% destilled water, at least -25° (-13° F)
Starting equipment Kick-and Electric starter; SX-F kickstarter only