23 TECHNICAL DATA
276
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
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