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TECHNICAL SPECIFICATIONS – ENGINE 125 SX, EXC, 200 EXC
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ENGINE
125 SX
125 EXC
200 EXC
Design
Liquid-cooled, single-cylinder, two-stroke engine with intake and exhaust control
Piston displacement
124.8 ccm
124.8 ccm
193 ccm
Bore / stroke
54 / 54.5 mm (2.126 / 2.145 in) 54 / 54.5 mm (2.126 / 2.145 in) 64 / 60 mm (2.52 / 2.362 in)
Fuel
unleaded fuel with at least RON 95 (USA = Premium RON 91), mixed with high grade two stroke oil
Oil / gasoline ratio
1:40-1:60 when using high grade, two- stroke oil (Motorex Cross Power 2T).
When in doubt, please contact your importer
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 ring
two plain compression rings
two plain compression rings
Dimension „X“
0,0 mm
Ignition timing
1.4 mm (0.055 in) (16.5°) BTDC 1.4 mm (0.055 in) (16.5°) BTDC 1.6 mm (0.063 in) (17°) BTDC
Spark plug
NGK BR9 EVX
NGK BR9 EVX
NGK BR 8 EG
Electrode gap
0,60 mm
Dimension „Z“
43,5 mm (1.68 in)
43,5 mm (1.68 in)
47 mm (1.85 in)
Primary drive
straight cut spur gears, primary ratio 23:73
Clutch
multiple disc clutch in oil bath, hydraulically operated (Motorex Kupplungs-Fluid 75)
Transmission
6 speed, claw actuated
6 speed, claw actuated
6 speed, claw actuated
Gear ratio
1st gear
13 : 32 „1S32“
12 : 33 „1G33“
12 : 33 „1G33“
2nd gear
„2S15“
15 : 30 „2S30“
„2S15“
15 : 31 „2G31“
„2S15“
15 : 31 „2G31“
3rd gear
„3S17H“ 17 : 28 „3S28H“
„3S17H“ 17 : 28 „3S28H“
„3S17H“ 17 : 28 „3S28H“
4th gear
„4S20H“ 20 : 28 „4S28“
„4S19H“ 19 : 26 „4S26“
„4S19H“ 19 : 26 „4S26“
5th gear
„5S19“
19 : 23 „5S23“H
„5S21“
21 : 25 „5S25“
„5G17H“ 17 : 19 „5G19H“
6th gear
„6S22“
22 : 24 „6S24“H
„6G20“
20 : 20 „6G20“
„6G22H“ 22 : 20 „6E20H“
Gear lubrication
0,7 liter Motorex Top Speed 4T 15W50
Available chain sprockets
13t / 14t for chain 5/8 x 1/4"
Coolant
1.2 litres, 50% anti freeze, 50% distilled water, at least -25 °C (-13 °F)
Ignition system
KOKUSAN 2K-1
KOKUSAN 2K-3
KOKUSAN 2K-3
Generator output
no generator
12V / 110 W
12V / 110 W
Ignition system XC-W
–
–
KOKUSAN 2K-2
Generator output
–
–
12V 40 W
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)
