TECHNICAL DATA 20
101
20.1 Engine
Design 1-cylinder 2-stroke engine, water-cooled, with reed
intake and exhaust control
Displacement 64.85 cm³ (3.9574 cu in)
Stroke 40.8 mm (1.606 in)
Bore 45 mm (1.77 in)
Idle speed 1,400 … 1,500 rpm
Control Exhaust control PCEV (Pneumatic Controlled Exhaust
Valve)
Crankshaft bearing 2 grooved ball bearings
Conrod bearing Needle bearing
Piston pin bearing Needle bearing
Pistons Aluminum cast
Piston rings 1 rectangular ring
Engine lubrication Mixed lubrication
Primary transmission 23:75 straight cut spur gear
Clutch Multidisc clutch in oil bath/hydraulically activated
Gearbox 6-gear transmission, claw shifted
Transmission ratio
1st gear 13:37
2nd gear 16:34
3rd gear 18:31
4th gear 21:30
5th gear 23:28
6th gear 24:26
Ignition Non-contact controlled fully electronic ignition system
with digital ignition adjustment
Spark plug NGK LR 8 B
Spark plug electrode gap 0.60 mm (0.0236 in)
Cooling Water-cooled
Starting aid Kick starter lever
20.2 Engine tightening torques
Lower part of control valve M4 4 Nm (3 lbf ft)
Loctite
®
648™
Nut, exhaust control diaphragm M5 4 Nm (3 lbf ft)
Screw, clutch line holder M5 5 Nm (3.7 lbf ft)
Screw, diaphragm cover of exhaust
control
M5 4 Nm (3 lbf ft)
Screw, ignition system/stator M5 5 Nm (3.7 lbf ft)
Loctite
®
222™
Screw, main shaft bearing retainer M5 5 Nm (3.7 lbf ft)
Loctite
®
243™
Screw, reed valve housing of
exhaust control
M5 5 Nm (3.7 lbf ft)
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