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22 TECHNICAL DATA 119
22.1 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 Plain bearing
Piston pin bearing No bearing bushes - DLC coated 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
First gear 2:32 PM
Second gear 4:26 PM
Third gear 8:25 PM
Fourth gear 10:23 PM
Fifth gear 25:22
Sixth gear 26:20
Alternator 12 V, 168 W
Ignition Contactless controlled fully electronic ignition with digital igni-
tion adjustment
Spark plug NGK LMAR9AI-10
Spark plug electrode gap 1.0 mm (0.039 in)
Cooling Water cooling, permanent circulation of coolant by water pump
Starting aid Electric starter
22.2 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 clutch 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, piston cooling M5 2 Nm (1.5 lbf ft) Loctite
®
243™
Screw, bearing bolt, oil pump idler
gear
M5 6 Nm (4.4 lbf ft) Loctite
®
243™
Screw, clutch spring M5 6 Nm (4.4 lbf ft)
121


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