21 TECHNICAL DATA
126
21.1 Engine
21.1.1 All 125 models
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)
Crankshaft bearing 1 grooved ball bearing/1 roller bearing
Conrod bearing Needle bearing
Piston pin bearing Needle bearing
Pistons Cast 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 transmission, claw shifted
Transmission ratio
first-gear 14:32
second-gear 15:30
third-gear 17:28
fourth-gear 19:27
fifth-gear 19:23
sixth-gear 22:24
Ignition Contactless controlled fully electronic ignition with
digital ignition adjustment
Spark plug NGK BR9 ECMVX
Spark plug electrode gap 0.60 mm (0.0236 in)
Starting aid (125 SX) Kick starter system
Starting aid (125 XC US) Electric starter system and kick starter system
21.1.2 150 SX
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)
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
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