English, Technical data - engine – KTM MXC User Manual
Page 53
ENGLISH
52
TECHNICAL DATA - ENGINE
»
TYPE
250 EXC
400 EXC
450 SX
450 MXC
450 EXC
525 SX
525 MXC-G 525 EXC
525 MXC DESERT
Design
Liquid-cooled single cylinder 4-stroke engine with balancer shaft
Displacement
250 cm
3
398 cm
3
449 cm
3
448 cm
3
510 cm
3
Bore/Stroke
75 / 56,5 mm 89 / 64 mm 95 / 63,4 mm 89 / 72 mm
95 / 72 mm
Ratio
12 : 1
11 : 1
Fuel
unleaded fuel with at least RON 95 (USA = Premium RON 91)
Valve timing
4 valves over rocker arm and 1 overhead camshaft, camshaft drive through single chain
Camshaft
5532
595/0121 590/5521 590/5521
55/21
590/5521
Valve diameter Intake
28 mm
35 mm
35 mm (Titan) 35 mm
Valve diameter Exhaust
24 mm
30 mm
30 mm (Titan) 30 mm
Valve clearence cold Intake
0.12 mm (0.0047 in)
Valve clearence cold Exhaust
0.12 mm (0.0047 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
straight geared spur wheels 33:76 Z
Clutch
multi disc clutch in oil bath
Transmission claw shifted
6-speed
6-speed
4-speed
6-speed
6-speed
4-speed
6-speed
6-speed
Gear ratio
1st
Gear
14:38
14:34
16:32
16:32
14:34
16:32
16:32
14:34
2nd Gear
16:36
17:31
18:30
18:30
17:31
18:30
18:30
17:31
3rd Gear
19:34
19:28
20:28
20:28
19:28
20:28
20:28
19:28
4th Gear
21:32
22:26
22:26
22:26
22:26
22:26
22:26
22:26
5th Gear
23:30
24:23
-
24:24
24:23
-
24:24
24:23
6th Gear
22:25
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
-
12V 150W
-
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, 40% antifreeze, 60% water, at least -25° (-13° F)
Starting equipment
kick - electric starter
kickstarter kick - electric starter
kickstarter kick - electric starter