23 TECHNICAL DATA 106
23.1 Engine
Design 1-cylinder 4-stroke engine, water-cooled
Displacement 349.7 cm³ (21.34 cu in)
Stroke 57.5 mm (2.264 in)
Bore 88 mm (3.46 in)
Compression ratio 12.3:1
Idle speed 1,950… 2,050 rpm
Control DOHC, four valves controlled via cam lever, drive via timing
chain
Valve diameter, intake 36.3 mm (1.429 in)
Valve diameter, exhaust 29.1 mm (1.146 in)
Valve clearance
Intake at: 20 °C (68 °F) 0.10… 0.15 mm (0.0039… 0.0059 in)
Exhaust at: 20 °C (68 °F) 0.13… 0.18 mm (0.0051… 0.0071 in)
Crankshaft bearing 2 cylinder bearings
Conrod bearing Slide bearing
Piston pin bearing Not a bearing bush - DLC-plated piston pins
Pistons Forged light alloy
Piston rings 1 compression ring, 1 oil scraper ring
Engine lubrication Pressure circulation lubrication with two Eaton pumps
Primary transmission 24:73
Clutch Multidisc clutch in oil bath/hydraulically activated
Transmission ratio
1st gear 14:32
2nd gear 16:26
3rd gear 20:25
4th gear 22:23
5th gear 25:22
6th gear 26:20
Alternator 12 V, 168 W
Ignition Contactless controlled fully electronic ignition with digital igni-
tion adjustment
Spark plug NGK LMAR9AI-8
Spark plug electrode gap 0.8 mm (0.031 in)
Cooling Water cooling, permanent circulation of coolant by water pump
Starting aid Kick starter and electric starter
23.2 Engine tightening torques
Nozzle, crank chamber ventilation M4 2 Nm (1.5 lbf ft) Loctite
®
243™
Oil nozzle for alternator cooling M4 2 Nm (1.5 lbf ft) Loctite
®
243™
Oil nozzle for balancer shaft lubrication M4 2 Nm (1.5 lbf ft) Loctite
®
243™
Oil nozzle for conrod bearing lubrica-
tion
M4 2 Nm (1.5 lbf ft) Loctite
®
243™
Screw, oil nozzle for piston cooling M4 2 Nm (1.5 lbf ft) Loctite
®
243™
Locking screw for bearing M5 6 Nm (4.4 lbf ft) Loctite
®
243™
Oil channel screw plug in alternator
cover
M5 1.2 Nm (0.89 lbf ft) Loctite
®
648™
Oil nozzle for cam lever lubrication M5 3 Nm (2.2 lbf ft) Loctite
®
243™
Oil nozzle for clutch lubrication M5 6 Nm (4.4 lbf ft) Loctite
®
243™
Oil nozzle, piston cooling M5 2 Nm (1.5 lbf ft) Loctite
®
243™
Screw, clutch spring M5 6 Nm (4.4 lbf ft) –
Screw, crankshaft position sensor M5 6 Nm (4.4 lbf ft) Loctite
®
243™
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