TECHNICAL DATA 23
119
23.1 Engine
Design 2-cylinder 4-stroke in-line engine, water-cooled
Displacement 890 cm³ (54.31 cu in)
Stroke 68.8 mm (2.709 in)
Bore 90.7 mm (3.571 in)
Compression ratio 13.5:1
Control DOHC, 4 valves per cylinder controlled via cam lever,
chain drive
Valve diameter, intake 37 mm (1.46 in)
Valve diameter, exhaust 30 mm (1.18 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) 0.15 … 0.20 mm (0.0059 … 0.0079 in)
Crankshaft bearing Slide bearing
Conrod bearing Slide bearing
Piston pin bearing Piston pin with bronze 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 39:75
Clutch Slipper clutch in oil bath/mechanically operated
Transmission 6-gear transmission, claw shifted
Transmission ratio
First gear 13:37
Second gear 17:34
Third gear 20:31
Fourth gear 22:28
Fifth gear 24:26
Sixth gear 23:22
Mixture preparation Electronic fuel injection
Ignition Contactless controlled fully electronic ignition with
digital ignition adjustment
Alternator 12 V, 400 W
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
Idle speed 1,600 ± 50 rpm
Starting aid Starter motor
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