Operation Manual

22 TECHNICAL DATA 121
22.1 Engine
22.1.1 125 XC‑W EU
Design 1-cylinder 2-stroke engine, water-cooled, with reed intake and
exhaust control
Displacement 124.8 cm³ (7.616 cu in)
Stroke 54.5 mm (2.146 in)
Bore 54 mm (2.13 in)
Idle speed 1,400… 1,500 rpm
Crankshaft bearing 1 grooved ball bearing/1 roller bearing
Conrod bearing Needle bearing
Piston pin bearing Needle bearing
Pistons Cast aluminum
Piston rings 2 half keystone rings
X (upper edge of piston to upper edge of cylinder) 0… 0.10 mm (0… 0.0039 in)
Z (height of control flap) 36.5 mm (1.437 in)
Primary transmission 23:73
Clutch Multidisc clutch in oil bath/hydraulically activated
Gearbox 6-gear, claw shifted
Transmission ratio
First gear 12:33
Second gear 15:31
Third gear 17:28
Fourth gear 19:26
Fifth gear 21:25
Sixth gear 20:20
Alternator 12 V, 75 W
Ignition Contactless controlled fully electronic ignition with digital igni-
tion adjustment, type Kokusan
Spark plug NGK BR9 ECMVX
Spark plug electrode gap 0.60 mm (0.0236 in)
Cooling Water cooling, permanent circulation of coolant by water pump
Starting aid Kick starter
22.1.2 150 XC‑W US
Design 1-cylinder 2-stroke engine, water-cooled, with reed intake and
exhaust control
Displacement 144 cm³ (8.79 cu in)
Stroke 54.5 mm (2.146 in)
Bore 58 mm (2.28 in)
Idle speed 1,400… 1,500 rpm
Crankshaft bearing 1 grooved ball bearing/1 roller bearing
Conrod bearing Needle bearing
Piston pin bearing Needle bearing
Pistons Forged aluminum
Piston rings 1 rectangular ring, 1 half keystone ring
X (upper edge of piston to upper edge of cylinder) 0… 0.10 mm (0… 0.0039 in)
Z (height of control flap) 36.5 mm (1.437 in)
Primary transmission 23:73
Clutch Multidisc clutch in oil bath/hydraulically activated
Gearbox 6-gear, claw shifted
Transmission ratio
First gear 12:33