KTM 150 SX - Page 114

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21 TECHNICAL DATA 112

Sixth gear 22:24

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)

Starting aid Kick starter

21.1.3 250 SX

Design 1-cylinder 2-stroke engine, water-cooled, with reed intake and

exhaust control

Displacement 249 cm³ (15.19 cu in)

Stroke 72 mm (2.83 in)

Bore 66.4 mm (2.614 in)

Exhaust valve - Beginning of adjustment 5,550 rpm

Exhaust valve - end of adjustment with red auxiliary spring 7,200 rpm

Exhaust valve - end of adjustment with yellow auxiliary spring 7,900 rpm

Exhaust valve - end of adjustment with green auxiliary spring 8,400 rpm

Crankshaft bearing 1 grooved ball bearing/1 roller bearing

Conrod bearing Needle bearing

Piston pin bearing Needle bearing

Pistons Aluminum cast

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) 48 mm (1.89 in)

Primary transmission 26:72

Clutch Multidisc clutch in oil bath/hydraulically activated

Gearbox 5-gear, claw shifted

Transmission ratio

First gear 14:28

Second gear 15:24

Third gear 18:24

Fourth gear 21:24

Fifth gear 22:21