23 TECHNICAL DATA
136
23.1
Engine
Design
1-cylinder 4-stroke engine, water-cooled
Displacement
249.91 cm³ (15.2505 cu in)
Stroke
52.3 mm (2.059 in)
Bore
78 mm (3.07 in)
Compression ratio
12.8:1
Idle speed
1,750 … 1,850 rpm
Control
DOHC, four valves controlled via cam lever, drive via
timing chain
Valve diameter, intake
32.5 mm (1.28 in)
Valve diameter, exhaust
26.5 mm (1.043 in)
Valve clearance
Intake at: 20 °C (68 °F)
0.10 … 0.15 mm (0.0039 … 0.0059 in)
Exhaust at: 20 °C (68 °F)
0.13 … 0.18 mm (0.0051 … 0.0071 in)
Crankshaft bearing
2 cylinder bearings
Conrod bearing
Slide bearing
Piston pin bearing
Bearing bush
Pistons
Forged light alloy
Piston rings
1 compression ring, 1 oil scraper ring
Engine lubrication
Pressure circulation lubrication with two Eaton pumps
Primary transmission
24:73
Clutch
Multidisc clutch in oil bath/hydraulically activated
Transmission ratio
First gear
13:32
Second gear
16:30
Third gear
16:24
Fourth gear
23:28
Fifth gear
23:23
Sixth gear
26:20
Alternator
12 V, 196 W
Ignition
Contactless controlled fully electronic ignition with
digital ignition adjustment
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
Starting aid
Electric starter