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10-2
Repair manual KTM 250 -F
Art.-No. 3.206.052-E
TECHNICAL DATA – ENGINE 250 SX-F 2005/06/07, SXS-F 2006/07
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
Valve timing
4 valves controlled by finger levers and 2 camshafts,
driven by a pair of spur gears and a tooth-type chain
Camshaft
05
Valve diameter Intake
30.9 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
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
Transmission claw shifted
6-speed
1st gear
13:32
2nd gear
15:30
3rd gear
17:28
4th gear
19:26
5th gear
21:25
6th gear
22:24
Ignition system
contactless DC-CDI ignition with digital advanced system by KOKUSAN
Generator
no 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)
BASIC CARBURATOR SETTING
250 SX-F 2005/06
250 SXS-F 2006
250 SX-F 2007
250 SXS-F 2007
Type
Keihin FCR-MX 39
Main jet
168
180
175
180
Jet needle
OBETP
Idling jet
40
Main air jet
200
Idling air jet
100
Needle position
5
th
from top
Starting jet
85
Mixture control screw open
1,25
Slide
15
Performance restrictor
–
Stop pump membrane
858 / 2,15 mm
Leak jet
-
50
Hot start device
2,5 mm
Summary of Contents for 2005 250 EXC-F SIX DAYS
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