TECHNICAL DATA - ENGINE. KTM 250 SX-F, 250 SX-F 2007, 450 SX-F 2007

TECHNICAL DATA – ENGINE

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ENGINE

Design

Displacement

Bore/Stroke

Ratio

Fuel

Valve timing

250 SX-F

Liquid-cooled single cylinder 4-stroke engine

249.51 ccm

76 / 55 mm

12.8 : 1

450 SX-F

449.3 ccm

97 / 60.8 mm

12.5 : 1 unleaded fuel with at least RON 95

4 valves controlled by finger levers and 2 camshafts,

Camshaft

Valve diameter Intake driven by a pair of spur gears and a tooth-type chain

05 773.36.009.100 / 773.36.010.100

30.9 mm 40.4 mm

Valve diameter Exhaust 26.5 mm

Valve clearence cold Intake 0.10 - 0.20 mm

Valve clearence cold Exhaust 0.12 - 0.22 mm

31.7 mm

0.15 mm

0.20 mm

Crank shaft bearing

Connecting rod bearing

Top end bearing

Piston

Piston rings

Engine lubrication

Engine oil

2 cylinder roller bearings needle bearing bronze bushing alluminium alloy forged

1 compression ring, 1 oil scraper ring pressure circulation lubrication with 2 rotor pumps full synthetic oil (see below)

Quantity of engine oil

Primary drive

1.1 liters

22:68

Transmission claw shifted 6-speed

1st gear 13:32

2nd gear

3rd gear

4th gear

15:30

17:28

19:26

1.3 liters

29:74

4-speed

17:32

19:30

21:28

23:26

5th gear

6th gear

Ignition system

Generator

Spark plug

Cooling system

Cooling liquid

Starting device

21:25

22:24 -

contactless DC-CDI ignition with digital advanced system by KOKUSAN no generator 42 Watts at 10.000 rpm

NGK CR 9 EBK liquid cooled, permanent rotation of cooling liquid through mechanically driven water pump

1.2 liters, 50% antifreeze, 50% destilled water, at least -25° (-13° F) kick starter E-starter

43

5W/40

JASO T903 MA

TEMPERATURE

5°C

41°F

10W/50

Engine oil

Only use fully synthetic engine oils that meet the JASO MA quality requirements

(see information on the can).

KTM recommends Motorex Power Synt 4T in the 10W/50 viscosity (for temperatures over 5°C, 41°F) or 5W/40 (for temperatures under 5°C, 41°F).

Poor oil quality or minor quantity cause early engine-wear.