22 TECHNICAL DATA 169
22.1 Engine
Design 1-cylinder 4-stroke engine, water-cooled
Displacement 690 cm³ (42.11 cu in)
Stroke 84.5 mm (3.327 in)
Bore 102 mm (4.02 in)
Compression ratio 12.6:1
Idle speed
Coolant temperature: ≥ 70 °C (≥ 158 °F) 1,550… 1,650 rpm
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 Piston pin with DLC coating
Pistons Forged light alloy
Piston rings 1 L-ring, 1 tapered compression piston ring, 1 oil scraper ring
Engine lubrication Semi-dry sump lubrication system with two rotor pumps
Primary transmission 36:79
Clutch APTC™ antihopping clutch in oil bath/hydraulically operated
Transmission 6-gear, claw shifted
Transmission ratio
1st gear 14:35
2nd gear 16:28
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