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23 TECHNICAL SPECIFICATIONS
23.1
Design
Displacement (All 450 models)
Displacement (All 500 EXC-F models, XW-F)
Stroke (All 450 models)
Stroke (All 500 EXC-F models, XW-F)
Bore
Compression ratio
Idle speed
Control
Valve diameter, intake
Valve diameter, exhaust
Valve clearance
Intake at: 20 °C (68 °F)
Exhaust at: 20 °C (68 °F)
Crankshaft bearing
Conrod bearing
Piston pin bearing
Pistons
Piston rings
Engine lubrication
Primary transmission
Clutch
Gearbox
Transmission ratio
first-gear
second-gear
third-gear
fourth-gear
fifth-gear
sixth-gear
Alternator
Ignition
Spark plug
Spark plug electrode gap
Cooling
Starting aid
146
Engine
1-cylinder 4-stroke engine, water-cooled
449.9 cm³ (27.455 cu in)
510.9 cm³ (31.177 cu in)
63.4 mm (2.496 in)
72 mm (2.83 in)
95 mm (3.74 in)
12.75:1
1,800 ... 1,900 rpm
OHC, 4 valves controlled via rocker arm
40 mm (1.57 in)
33 mm (1.3 in)
0.10 ... 0.15 mm (0.0039 ... 0.0059 in)
0.12 ... 0.17 mm (0.0047 ... 0.0067 in)
2 cylinder roller bearing
Slide bearing
Bearing bush
Forged light alloy
1 compression ring, 1 oil scraper ring
Pressure circulation lubrication with 2 trochoidal
pumps
29:72
Multidisc clutch in oil bath, hydraulically activated
6-gear transmission, claw shifted
13:33
16:30
18:26
22:26
23:23
26:22
14 V, 196 W
Contactless controlled fully electronic ignition with
digital ignition adjustment
NGK LZMAR8BI - 10
1.0 mm (0.039 in)
Water cooling, permanent circulation of coolant by
water pump
Starter motor
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