10-5
ENGINE
250 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
Camshaft
Intake: 770.36.009.100 / Exhaust: 770.36.110.100
Valve diameter Intake
30.9 mm
Valve diameter Exhaust
26.5 mm
Valve clearence cold Intake 0.10 - 0.20 mm (0.004 - 0.008 in)
Valve clearence cold Exhaust 0.12 - 0.22 mm (0.005 - 0.009 in)
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 150 W
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 - electric starter
TECHNICAL DATA – ENGINE 250 XC-F, XCF-W, EXC-F 2007
BASIC CARBURATOR SETTING
250 XCF-W ZA
250 XC-F, XCF-W USA
250 EXC-F EU, AUS
250 EXC-F SIXDAYS
Type
Keihin FCR-MX 3900G Keihin FCR-MX 3900G Keihin FCR-MX 3900G Keihin FCR-MX 3900G
Main jet
168
168
168
172
Jet needle
OBETP
OBEKT
OBEKT
OBETP
Idling jet
42
40
40
42
Main air jet
200
200
200
200
Idling air jet
100
100
100
100
Needle position
5th from top
3rd from top
2nd from top
5th from top
Starting jet
85
85
85
85
Mixture control screw open
1,25
0,75
0,75
1,25
Slide
15
15
15
15
Performance restrictor
–
–
Slide stop
–
Stop pump membrane
858 / 2,15 mm
858 / 2,15 mm
858 / 2,15 mm
858 / 2,15 mm
Leak jet
70
70
70
70
Summary of Contents for 2005 250 EXC-F SIX DAYS
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Page 111: ...TROUBLE SHOOTING Repair manual KTM 250 F Art No 3 206 052 E TROUBLE SHOOTING 9 2 INDEX 9 1 9 ...
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