21 TECHNICAL DATA 113
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 6-gear, claw shifted
Transmission ratio
First gear 14:32
Second gear 16:26
Third gear 20:25
Fourth gear 22:23
Fifth gear 25:22
Sixth gear 26:20
Ignition 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
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)
Bore 72 mm (2.83 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 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
First gear 14:32
Second gear 16:26
Third gear 20:25
Fourth gear 22:23
Fifth gear 25:22
Sixth gear 26:20
Ignition 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
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