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25
TECHNICAL DATA
206
25.1
Engine
Design
1-cylinder 4-stroke engine, water-cooled
Displacement
249.91 cm
3
(15.2505 cu in)
Stroke
52.3 mm (2.059 in)
Bore
78 mm (3.07 in)
Compression ratio
12.8:1
Idle speed
2,050 ... 2,150 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
1st gear
13:32
2nd gear
16:30
3rd gear
16:24
4th gear
23:28
5th gear
23:23
6th gear
26:20
Alternator
12V, 168W
Ignition
Contactless controlled fully electronic ignition with digital igni-
tion adjustment
Spark plug
NGK LMAR9Al-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
25.2
Tolerance, engine wear limits
Valve - run-out
At the valve plate
s 0.05 mm (s 0.002 in)
Valve spring
Minimum length of intake valve
42 mm (1.65 in)
Minimum length of exhaust valve
42 mm (1 .65 in)
Valve - sealing seat width
Intake
1 .40 mm (0.0551 in)
Exhaust
1 .40 mm (0.0551 in)
Valve spring seat - thickness
0.90 ... 1.10 mm (0.0354 ... 0.0433 in)
Camshaft bearing - sleeve bearing
Radial clearance
0.020 ... 0.054 mm (0.00079 ... 0.00213 in)
Wear limit
0.065 mm (0.00256 in)
Cylinder/cylinder head - distortion of sealing area
s 0.10 mm (S 0.0039 in)