21 TECHNICAL DATA
108
21.1 Engine
Design 1-cylinder 4-stroke engine, water-cooled
Displacement 692.7 cm³ (42.271 cu in)
Stroke 80 mm (3.15 in)
Bore 105 mm (4.13 in)
Compression ratio 12.7:1
Idle speed
Coolant temperature: ≥ 70 °C (≥ 158 °F) 1,600 ± 50 rpm
Control OHC, intake with cam levers, exhaust controlled by
rocker arm, chain drive
Valve diameter, intake 42 mm (1.65 in)
Valve diameter, exhaust 34 mm (1.34 in)
Valve play, cold
Intake at: 20 °C (68 °F) 0.10 … 0.15 mm (0.0039 … 0.0059 in)
Exhaust at: 20 °C (68 °F) 0.22 … 0.27 mm (0.0087 … 0.0106 in)
Crankshaft bearing 2 roller bearings
Conrod bearing Slide bearing
Piston pin bearing Piston pin with DLC coating
Pistons Forged light alloy
Piston rings 1 compression ring, 1 lower compression ring, 1 oil
ring with spring expander
Engine lubrication Semi-dry sump lubrication system with two trochoid
pumps
Primary transmission 36:79
Clutch APTC™ antihopping clutch in oil bath/hydraulically
operated
Transmission 6-gear transmission, claw shifted
Transmission ratio
First gear 14:35
Second gear 16:28
Third gear 20:27
Fourth gear 21:23
Fifth gear 23:22
Sixth gear 23:20
Mixture preparation Electronic fuel injection
Ignition Contactless controlled fully electronic ignition with
digital ignition adjustment
Alternator 12 V, 300 W
Spark plug
Inside spark plug NGK LKAR9BI‑10
Outside spark plug NGK LMAR7DI‑10
Spark plug electrode gap 1.0 mm (0.039 in)
Cooling Water cooling, permanent circulation of coolant by
water pump
Starting aid Starter motor, automatic decompression
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