23 TECHNICAL DATA
143
23.1 Engine
Design 1-cylinder 4-stroke engine, water-cooled
Displacement (FE 450 US) 449.9 cm³ (27.455 cu in)
Displacement (FE 501 US) 510.9 cm³ (31.177 cu in)
Stroke (FE 450 US) 63.4 mm (2.496 in)
Stroke (FE 501 US) 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 grooved ball bearings
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
Gearbox 6-gear, claw shifted
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, 168 W
Ignition Contactless controlled fully electronic ignition with
digital ignition adjustment
Spark plug NGK LKAR9AI-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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