TECHNICAL DATA - ENGINE 173
Design 1-cylinder 4-stroke engine, water-cooled
Displacement 654 cm³ (39.91 cu in)
Stroke 80 mm (3.15 in)
Bore 102 mm (4.02 in)
Compression ratio 11.8:1
Control OHC, 4 valves controlled via rocker arm, chain drive
Valve diameter, intake 40 mm (1.57 in)
Valve diameter, exhaust 34 mm (1.34 in)
Valve play, cold 0.07… 0.13 mm (0.0028… 0.0051 in)
Crankshaft bearing 2 roller bearings
Conrod bearing Needle bearing
Piston pin bearing Bronze bush
Pistons Forged light alloy
Piston rings 1 L-ring, 1 tapered compression piston ring, 1 oil scraper ring
Engine lubrication Semi-dry sump lubrication with two rotor pumps
Primary transmission 36:79
Clutch APTCâ„¢ Antihopping clutch in oil bath / hydraulically operated
Gearbox 6-gears, claw-shifted
Transmission ratio
1st gear 14:35
2nd gear 16:28
3rd gear 21:28
4th gear 21:23
5th gear 23:22
6th gear 23:20
Mixture preparation Electronic fuel injection
Ignition Contactless controlled fully electronic ignition with digital igni-
tion adjustment
Alternator 12 V, 224 W
Spark plug NGK LKAR 8AI - 9
Spark plug electrode gap 0.9 mm (0.035 in)
Cooling Water cooling, permanent circulation of coolant by water pump
Idle speed
Coolant temperature: ≥ 70 °C (≥ 158 °F) 1,550… 1,650 rpm
Starting aid Electric starter, automatic decompressor
26.1Capacity - engine oil
Engine oil 1.70 l (1.8 qt.) Engine oil (SAE 10W/60) (00062010035) ( p. 208)
Alternative engine oil Engine oil (SAE 10W/50)
( p. 208)
26.2Capacity - coolant
Coolant 1.20 l (1.27 qt.) Coolant ( p. 208)
Coolant (mixed ready to use) ( p. 208)
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