KTM 250 EXC 2004 - Manual (Page 53)

ENGLISH
52
Engine
250 SX
250 EXC
300 MXC/EXC
Desgin
Liquid-cooled single-cylinder two-stroke engine with
KTM T
win
V
alve
C
ontrol exhaust system and
K
TM
T
orque
C
hamber
Piston displacement
249 ccm
293,15 ccm
Bore / stroke
66,4 / 72 mm (2.62 / 2.84 in)
72 / 72 mm (2.84 / 2.84 in)
Fuel
unleaded fuel with at least RON 95 (USA = Premium RON 91), mixed with high grade two stroke oil (Motorex Cross Power 2T)
Oil / gasolino ratio
1:40 – 1:60 when using high grade, two- stroke oil. When in dout, please contact your importer or use 1:40
mix ratio to be on the safe side
Crankshaft bearing
1 deep-groove ball bearing / 1 cylinder roller bearing
Connecting rod bearing
needle bearing
Piston pin bearing
needle bearing
Piston
cast piston
Piston ring
one plain compression rings
two plain compression rings
Dimension
“X“
0 + 0,1 mm (0 + 0.004 in)
Ingition timing
1,9 mm vor OT
Spark plug
NGK BR
8 ECM
NGK
BR
7 ES
Electrode gap
0,60 mm
Dimension
“Z“
48,5 mm (1.9 in) - 0,2 mm (0,008 in)
TVC start open
5200/min
TVC fully open
7000/min (red additional spring), 7500/min (yellow additional spring)
Primary drive
straight cut spur gears, primary ratio 26:72
Clutch
multiple disc clutch in oil bath, hydraulically operated (Motorex Kupplungs- Fluid 75)
Transmission
5 speed, claw actuated
Gear ratio
250,300 EXC
300 MXC
1 st
gear
14:28
14:30
14:28
2 nd
gear
16:26
17:26
16:26
3 rd
gear
18:24
19:23
18:24
4 th
gear
21:24
20:20
21:24
5 th
gear
22:21
29:23
22:21
Gear lubrication
0,7 l engine oil (Motorex Topspeed 4T 15W50)
ailable chain sprockets
13Z / 14Z / 15Z for chain
5
/ 8
x
1
/ 4
"
Coolant
1.3 liters, 40% antifreeze, 60% water, at least -25 °C (-13 °F)
Ignition system
KOKUSAN 2K-3
KOKUSAN 2K-3
Generator output
–
12V 110W
Ignition system USA (MXC)
KOKUSAN
2K-2
Generator output
12V 40W
Carburetor
flat-slide carburetor, carburetor setting see table
Air- filter
wet foam type air filter insert
(upper edge piston - upper edge cylinder) (height of the control flap)
TECHNICAL DA
TA
– ENGINE 250/300 SX, MXC, EXC 2004