KTM 250 EXC RACING Owner's Manual page 206

TECHNICAL DATA – ENGINE
Type
Design
Displacement
Bore/Stroke
Ratio
Fuel
Valve timing
Camshaft
Valve diameter Intake
Valve diameter Exhaust
Valve clearence cold Intake
Valve clearence cold Exhaust
Crank shaft bearing
Connecting rod bearing
Top end bearing
Piston alluminium alloy -
Piston rings
Engine lubrication
Engine oil
Quantity of engine oil
Primary ratio
Clutch
Transmission claw shifted
Gear ratio
1 Gear
st
2 nd Gear
3 rd Gear
4 Gear
th
5 th Gear
6 th Gear
Ignition system
Generator
Spark plug
Spark plug gap
Cooling system
Cooling liquid
Starting equipment
250/450/525 SX, MXC, EXC RACING 2004
250 EXC 450 SX
Liquid-cooled single cylinder 4-stroke engine with balancer shaft
250 cc 449 cc
75 / 56.5 mm 95 / 63.4 mm
12:1
unleaded fuel with at least RON 95 (USA = Premium RON 91)
4 valves over rocker arm and 1 overhead camshaft, camshaft drive through single chain
5532 590/5521
28 mm 35 mm (Titan)
24 mm 30 mm (Titan)
cast forged
pressure circulation lubrication with two rotor pumps
full synthetic oil (Motorex Power Synt 4T 10W/50)
6-speed 4-speed
14:38 16:32
16:36 18:30
19:34 20:28
21:32 22:26
23:30 -
22:25 -
contactless DC-CDI ignition with digital advanced system by KOKUSAN
12V 150W -
liquid cooled, permanent rotation of cooling liquid through mechanically driven water pump
1 liter, 40% antifreeze, 60% water, at least -25° (-13° F)
kick-electric starter kickstarter
450 MXC 450 EXC
448 cc
89 / 72 mm
590/5521
0.12 mm (0.0047 in)
0.12 mm (0.0047 in)
2 cylinder roller bearing
needle bearing
bronze bushing
cast
1 compression ring, 1 oil scraper ring
1.25 liters
straight geared spur wheels 33:76 Z
multi disc clutch in oil bath
6-speed 6-speed
16:32 14:34
18:30 17:31
20:28 19:28
22:26 22:26
24:24 24:23
21:18 26:21
12V 150W
NGK DCPR 8 E
0.6 mm (0.02367 in)
kick - electric starter
525 SX 525 MXC-G USA
510 cc
95 / 72 mm
11:1
55/21 590/5521
35 mm
30 mm
forged
4-speed 6-speed
16:32 16:32
18:30 18:30
20:28 20:28
22:26 22:26
- 24:24
- 21:18
- 12V 150W
kickstarter kick - electric starter
10-13E
525 EXC
525 MXC Desert
6-speed
14:34
17:31
19:28
22:26
24:23
26:21