20 TECHNICAL DATA 75
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 Mixture oil lubrication
Primary transmission 23:75 straight cut spur gear
Clutch Multidisc clutch in oil bath/hydraulically activated
Gearbox 6-gear, 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 digi-
tal ignition adjustment
Spark plug NGK LR 8 B
Spark plug electrode gap 0.60 mm (0.0236 in)
Cooling Water-cooled
Starting aid Kickstarter
20.2 Engine tightening torques
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
®
648™
Screw, reed valve housing of exhaust
control
M5 5 Nm (3.7 lbf ft) –
Screw, retaining bracket for return
spring of shift shaft
M5 6 Nm (4.4 lbf ft)
Loctite
®
243™
Screw, shift drum locating M5 6 Nm (4.4 lbf ft)
Loctite
®
243™
Screw, water pump wheel M5 5 Nm (3.7 lbf ft)
Loctite
®
243™
Drain plug, water pump cover M6 6 Nm (4.4 lbf ft) –
Screw, alternator cover M6 8 Nm (5.9 lbf ft) –
Screw, clutch intermediate cover M6 10 Nm (7.4 lbf ft) –
Screw, clutch slave cylinder M6 10 Nm (7.4 lbf ft)
Loctite
®
243™
Screw, clutch springs M6 10 Nm (7.4 lbf ft) –
Screw, engine case M6 10 Nm (7.4 lbf ft) –
Screw, engine sprocket cover M6 10 Nm (7.4 lbf ft) –
Screw, exhaust flange M6 10 Nm (7.4 lbf ft)
Loctite
®
243™
To Next Page
Loading...
Need help?
General
