Technical Data - Engine 250 / 300 - KTM 125 SX Owner's Manual

TECHNICAL SPECIFICATIONS – ENGINE 250 SX, EXC, 300 MXC, EXC
ENGINE
Design
Piston displacement
Bore / stroke
Fuel
Oil / gasoline ratio
Crankshaft bearing
Connecting rod bearing
Piston pin bearing
Piston
Piston ring
Dimension „X" (upper edge piston-
upper edge cylinder)
Ignition timing
Spark plug
Electrode gap
Dimension „Z"
(height of the control flap)
TVC start open
52
TVC fully open
Primary drive
Clutch
Transmission
Gear ratio
1st gear
2nd gear
3rd gear
4th gear
5th gear
Gear lubrication
Available chain sprockets
Coolant
Ignition system
Generator output
Ignition system USA
Generator output
Vergaser
Air-filter
250 SX
Liquid-cooled single-cylinder two-stroke engine
with KTM Twin Valve Control exhaust system and KTM Torque Chamber
249 ccm
66.4 / 72 mm (2.62 / 2.84 in)
unleaded fuel with at least RON 95 (USA = Premium RON 91), mixed with high grade two stroke oil (Motorex Cross Power 2T)
1:40 – 1:60 when using high grade, two- stroke oil.
When in doubt, please contact your importer or use 1:40 mix ratio to be on the safe side
1 deep-groove ball bearing / 1 cylinder roller bearing
needle bearing
needle bearing
cast piston
two plain compression rings
0 + 0,1 mm (0 + 0.004 in)
1,9 mm (0.074 in) BTDC
NGK BR8 ECM
0,60 mm
48,5 mm (1.9 in) - 0,2 mm (0,008 in)
5200/min
7000/min (red spring), 7500/min (yellow spring), 7900/min (green spring)
straight cut spur gears, primary ratio 26:72
multiple disc clutch in oil bath, hydraulically operated (Motorex Kupplungs- Fluid 75)
5 speed, claw actuated
250 SX
14 : 28
16 : 26
18 : 24
21 : 24
22 : 21
0,7 liter Motorex Top Speed 4T 15W50
13t / 14t for chain 5/8 x 1/4"
1.2 litres, 50% anti freeze, 50% water, at least -25 °C (-13 °F)
KOKUSAN 2K-1
no generator
KOKUSAN 2K-1
no generator
flat-slide carburetor, carburetor setting see table
wet foam type air filter insert
250 EXC
249 ccm
66.4 / 72 mm (2.62 / 2.84 in) 72 / 72 mm (2.84 / 2.84 in)
two plain compression rings
NGK BR7 ES
250/300 EXC
14 : 30
17 : 26
19 : 23
20 : 20
29 : 23
KOKUSAN 2K-3
12V / 110 W
KOKUSAN 2K-2
12V 40 W
300 MXC/EXC
293.15 ccm
two plain compression rings
NGK BR 7 ES
300 MXC
14 : 28
16 : 26
18 : 24
21 : 24
22 : 21
KOKUSAN 2K-3
12V / 110 W
KOKUSAN 2K-2
12V 40 W
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