21 TECHNICAL DATA 100
5th gear 19:23
6th gear 22:24
Ignition Contactless controlled fully electronic ignition with digital igni-
tion adjustment, type Kokusan
Ignition point (BTDC) 1.4 mm (0.055 in)
Spark plug NGK BR9 ECMVX
Spark plug electrode gap 0.60 mm (0.0236 in)
Starting aid Kick starter
21.1.3 250 SX EU, 250 SX USA
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 5,600 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
1st gear 14:28
2nd gear 15:24
3rd gear 18:24
4th gear 21:24
5th gear 22:21
Ignition Contactless controlled fully electronic ignition with digital igni-
tion adjustment, type Kokusan
Ignition point (BTDC) 1.9 mm (0.075 in)
Spark plug NGK BR 8 ECM
Spark plug electrode gap 0.60 mm (0.0236 in)
Starting aid Kick starter
21.1.4 150 XC USA
Design 1-cylinder 2-stroke engine, water-cooled, with reed intake and
exhaust control
Displacement 143.6 cm³ (8.763 cu in)
Stroke 58.4 mm (2.299 in)
Bore 56 mm (2.2 in)
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
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