TECHNICAL DATA 23
147
23.1 Engine
Design 1-cylinder 4-stroke engine, water-cooled
Displacement (All 450 models) 449.9 cm³ (27.455 cu in)
Displacement (All 500 models) 510.9 cm³ (31.177 cu in)
Stroke (All 450 models) 63.4 mm (2.496 in)
Stroke (All 500 models) 72 mm (2.83 in)
Bore 95 mm (3.74 in)
Compression ratio 11.8:1
Idle speed 1,800 … 1,900 rpm
Control OHC, 4 valves controlled via rocker arm
Valve diameter, intake 40 mm (1.57 in)
Valve diameter, exhaust 33 mm (1.3 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) 0.12 … 0.17 mm (0.0047 … 0.0067 in)
Crankshaft bearing 2 cylinder roller bearing
Conrod bearing Slide bearing
Piston pin bearing Not a bearing bush - DLC-plated piston pins
Pistons Forged light alloy
Piston rings 1 compression ring, 1 oil scraper ring
Engine lubrication Pressure circulation lubrication with two Eaton pumps
Primary transmission 31:76
Clutch Multidisc clutch in oil bath, hydraulically activated
Transmission ratio
First gear 14:36
Second gear 17:32
Third gear 19:28
Fourth gear 22:26
Fifth gear 23:24
Sixth gear 26:21
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
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