Technical data – engine, English, Jaso t903 ma – KTM 250 XC-F User Manual
Page 55
TECHNICAL DATA – ENGINE
»
ENGLISH
54
JASO T903 MA
5°C
41°F
+
–
10W/50
5W/40
250-F:
TEMPERA
TUR
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
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 in the 10W/50 viscosity (for tem-
peratures 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.