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25 TECHNICAL DATA
25.1
Design
Displacement (all 450 models)
Displacement (all 501 models)
Stroke (all 450 models)
Stroke (all 501 models)
Bore
Compression ratio
Idle speed
Control
Valve diameter, intake
Valve diameter, exhaust
Valve clearance
Exhaust at: 20 °C (68 °F)
Intake at: 20 °C (68 °F)
Crankshaft bearing
Conrod bearing
Piston pin bearing
Pistons
Piston rings
Engine lubrication
Primary transmission
Clutch
Transmission ratio
1st gear
2nd gear
3rd gear
4th gear
5th gear
6th gear
Alternator
Ignition
Spark plug
Spark plug electrode gap
Cooling
Starter
246
Engine
1-cylinder 4-stroke engine, water-cooled
449.3 cm
(27.418 cu in)
3
510.4 cm
(31.147 cu in)
3
63.4 mm (2.496 in)
72 mm (2.83 in)
95 mm (3.74 in)
11,8:1
1,800 ... 1,900 rpm
OHC, 4 valves controlled via rocker arm, drive via
tooth/wheel chain
40 mm (1.57 in)
33 mm (1.3 in)
0.12 ... 0.17 mm (0.0047 ... 0.0067 in)
0.10 ... 0.15 mm (0.0039 ... 0.0059 in)
2 grooved ball bearings
Slide bearing
No bearing bushes - DLC-plated piston pins
Forged light alloy
1 compression ring, 1 oil scraper ring
Pressure circulation lubrication with two rotary
pumps
32:76
Multidisc clutch in oil bath / hydraulically activated
14:36
17:32
19:28
22:26
24:23
26:21
12V, 200W
Contactless controlled fully electronic ignition with
digital ignition adjustment, type Kokusan
NGK LKAR BAI - 9
0.9 mm (0.035 in)
Water, permanent circulation of coolant by water
pump
Electric starter
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