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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:
TEMPERATUR
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.