21 TECHNICAL DATA 108
Transmission ratio
First gear 15:31
Second gear 16:25
Third gear 20:25
Fourth gear 22:23
Fifth gear 25:22
Sixth gear 26:20
Ignition system Contactless controlled, fully electronic ignition with digital igni-
tion adjustment, type Kokusan
Spark plug NGK BR 7 ES
Spark plug electrode gap 0.60 mm (0.0236 in)
Starting aid Kick starter and electric starter
21.1.5 300 XC US
Design 1-cylinder 2-stroke engine, water-cooled, with reed intake and
exhaust control
Displacement 293.2 cm³ (17.892 cu in)
Stroke 72 mm (2.83 in)
Hole 72 mm (2.83 in)
Exhaust valve, beginning of adjustment 5,150 rpm
Crankshaft bearing 1 grooved ball bearing/1 roller bearing
Conrod bearing Needle bearing
Piston pin bearing Needle bearing
Piston Cast aluminum
Piston rings 2 rectangular rings
X distance (upper edge of piston to upper edge of cylinder) 0… 0.10 mm (0… 0.0039 in)
Z distance (height of control flap) 49.5 mm (1.949 in)
Primary transmission 26:73
Clutch Multidisc clutch in oil bath/hydraulically activated
Transmission 6-gear, claw shifted
Transmission ratio
First gear 15:31
Second gear 16:25
Third gear 20:25
Fourth gear 22:23
Fifth gear 25:22
Sixth gear 26:20
Ignition system Contactless controlled, fully electronic ignition with digital igni-
tion adjustment, type Kokusan
Spark plug NGK BR 7 ES
Spark plug electrode gap 0.60 mm (0.0236 in)
Starting aid Kick starter and electric starter
21.2 Engine tightening torques
21.2.1 All 125/150 models
Screw, inner membrane sheets EJOT DELTA PT
®
35x25 1 Nm (0.7 lbf ft) –
Screw, membrane core plate EJOT DELTA PT
®
30x12 1 Nm (0.7 lbf ft) –
Screw, outer membrane sheets EJOT DELTA PT
®
30x6 1 Nm (0.7 lbf ft) –
Screw, control lever, exhaust control M5 6 Nm (4.4 lbf ft) Loctite
®
243™
Screw, crankshaft position sensor M5 6 Nm (4.4 lbf ft) Loctite
®
243™
Screw, exhaust control cover M5 6 Nm (4.4 lbf ft) –
Screw, locking lever M5 6 Nm (4.4 lbf ft) Loctite
®
243™
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