23 TECHNICAL DATA
146
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
1,400
± 50
rpm
Starting aid
Starter motor