Technical data – engine, English, Jaso t903 ma – KTM 250 XC-F User Manual
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TECHNICAL DATA – ENGINE
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ENGLISH
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ENGINE
400 XC-W, EXC
450 XC
450 XC-W, EXC
525 XC
525 XC-W, EXC
Design
Liquid-cooled single cylinder 4-stroke engine with balancer shaft
Displacement
398 cc
449 cc
448 cc
510 cc
Bore/Stroke
89 / 64 mm
95 / 63,4 mm
89 / 72 mm
95 / 72 mm
Ratio
11 : 1
12 : 1
11 : 1
11 : 1
Fuel
unleaded fuel with at least RON 95 (USA = Premium PON 91)
Valve timing
4 valves over rocker arm and 1 overhead camshaft, camshaft drive through single chain
Camshaft
595/0121
590/5521
590/5521
590/5521
Valve diameter Intake
35 mm
Valve diameter Exhaust
30 mm
Valve clearence cold Intake
0.10 - 0.15 mm (0,004 - 0,006 in)
Valve clearence cold Exhaust
0.10 - 0.15 mm (0,004 - 0,006 in)
Crank shaft bearing
2 cylinder roller bearing
Connecting rod bearing
needle bearing
Top end bearing
bronze bushing
Piston alluminium alloy
cast
forged
cast
forged
Piston rings
1 compression ring, 1 oil scraper ring
Engine lubrication
pressure circulation lubrication with two rotor pumps
Engine oil
full synthetic oil (Motorex Power Synt 4T 10W/50)
Quantity of engine oil
1.25 liters
Primary ratio
Primary ratio
Clutch
multiple disc clutch in oil bath, hydraulically operated (Motorex Kupplungsfluid 75)
Transmission claw shifted
6-speed
6-speed
6-speed
6-speed
6-speed
Gear ratio
1st Gear
14:34
14:34
14:34
16:32
14:34
2nd Gear
17:31
17:31
17:31
18:30
17:31
3rd Gear
19:28
20:28
19:28
20:28
19:28
4th Gear
22:26
22:26
22:26
22:26
22:26
5th Gear
24:23
24:24
24:23
24:24
24:23
6th Gear
26:21
21:18
26:21
21:18
26:21
Ignition system
contactless DC-CDI ignition with digital advanced system by KOKUSAN
Generator
12V 150W
Spark plug
NGK DCPR 8 E
Spark plug gap
0.6 mm (0.02367 in)
Cooling system
liquid cooled, permanent rotation of cooling liquid through mechanically driven water pump
Cooling liquid
1 liter, 50% antifreeze, 50% destilled water, at least -25° (-13° F)
Starting equipment
kick - electric starter
JASO T903 MA
0°C
32°F
+
–
10W/50
5W/40
400/450/525:
TEMPERA
TUR
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 0°C, 32°F) or 5W/40 (for temperatures under 0°C, 32°F).
Poor oil quality or minor quantity cause early engine-wear.