21 TECHNICAL DATA 102
21.1.6 300 XC EU/USA
Design 1-cylinder 2-stroke engine, water-cooled, with reed intake and
exhaust control
Displacement 293 cm³ (17.88 cu in)
Stroke 72 mm (2.83 in)
Bore 72 mm (2.83 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 rectangular rings
X (upper edge of piston to upper edge of cylinder) 0… 0.10 mm (0… 0.0039 in)
Z (height of control flap) 48.5 mm (1.909 in)
Primary transmission 26:72
Clutch Multidisc clutch in oil bath/hydraulically activated
Gearbox 6-gear, claw shifted
Transmission ratio
1st gear 15:31
2nd gear 16:25
3rd gear 20:25
4th gear 22:23
5th gear 25:22
6th gear 26:20
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 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, membrane M4 2 Nm (1.5 lbf ft)
Loctite
®
243™
Locking screw for bearing M5 6 Nm (4.4 lbf ft)
Loctite
®
243™
Screw, alternator cover M5 5 Nm (3.7 lbf ft) –
Screw, centrifugal timer M5 8 Nm (5.9 lbf ft)
Loctite
®
243™
Screw, exhaust control cover M5 5 Nm (3.7 lbf ft) –
Screw, exhaust flange M5 6 Nm (4.4 lbf ft) –
Screw, ignition system/stator M5 6 Nm (4.4 lbf ft)
Loctite
®
222
Screw, lock washer, axle for control
flap
M5 6 Nm (4.4 lbf ft)
Loctite
®
243™
Screw, locking lever M5 6 Nm (4.4 lbf ft)
Loctite
®
243™
Screw, water pump wheel M5 6 Nm (4.4 lbf ft)
Loctite
®
243™
Adjustment cable, exhaust control M6 10 Nm (7.4 lbf ft)
Loctite
®
243™
Bleeder screw, cylinder head M6 10 Nm (7.4 lbf ft) –
Screw, clutch cover M6 10 Nm (7.4 lbf ft) –
Screw, clutch slave cylinder M6 10 Nm (7.4 lbf ft)
Loctite
®
243™
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