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23.1
Engine
Design
Displacement
Stroke
Bore
Compression ratio
Control
Valve diameter, intake
Valve diameter, exhaust
Valve play, cold
Intake at: 20 °C (68 °F)
Exhaust at: 20 °C (68 °F)
Crankshaft bearing
Conrod bearing
Pistons
Piston rings
Engine lubrication
Primary transmission
Clutch
Transmission
Transmission ratio
First gear
Second gear
Third gear
Fourth gear
Fifth gear
Sixth gear
Mixture preparation
Ignition
Alternator
Spark plug
Spark plug electrode gap
Cooling
Idle speed
Starting aid
TECHNICAL DATA 23
2-cylinder 4-stroke in-line engine, water-cooled
890 cm³ (54.31 cu in)
68.8 mm (2.709 in)
90.7 mm (3.571 in)
13.5:1
DOHC, 4 valves per cylinder controlled via cam lever,
chain drive
37 mm (1.46 in)
30 mm (1.18 in)
0.10 ... 0.15 mm (0.0039 ... 0.0059 in)
0.15 ... 0.20 mm (0.0059 ... 0.0079 in)
Slide bearing
Slide bearing
Forged light alloy
1 compression ring, 1 lower compression ring, 1 oil
ring with spring expander
Semi-dry sump lubrication system with two trochoid
pumps
39:75
Slipper clutch in oil bath/mechanically operated
6-gear transmission, claw shifted
13:37
17:34
20:31
22:28
24:26
23:22
Electronic fuel injection
Contactless controlled fully electronic ignition with
digital ignition adjustment
12 V, 400 W
NGK LMAR9AI‑10
1.0 mm (0.039 in)
Water cooling, permanent circulation of coolant by
water pump
1,400
rpm
± 50
Starter motor
143
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