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TECHNICAL DATA - ENGINE 91
Design 1-cylinder 4-stroke engine, water-cooled
Displacement (450 EXC USA) 449.3 cm³ (27.418 cu in)
Displacement (530 EXC USA) 510.4 cm³ (31.147 cu in)
Stroke (450 EXC USA) 63.4 mm (2.496 in)
Stroke (530 EXC USA) 72 mm (2.83 in)
Bore 95 mm (3.74 in)
Compression ratio 11.9:1
Idle speed 1,550… 1,650 rpm
Control OHC, 4 valves controlled via rocker arm, drive via tooth/wheel
chain
Valve diameter, intake 39.5 mm (1.555 in)
Valve diameter, exhaust 31.7 mm (1.248 in)
Valve clearance
Exhaust at: 20 °C (68 °F) 0.12… 0.17 mm (0.0047… 0.0067 in)
Intake at: 20 °C (68 °F) 0.10… 0.15 mm (0.0039… 0.0059 in)
Crankshaft bearing 2 grooved ball bearings
Conrod bearing Needle bearing
Piston pin bearing No bearing bushes - DLC-plated piston pins
Pistons Forged light alloy
Piston rings 1 compression ring, 1 oil scraper ring
Engine lubrication Pressure circulation lubrication with 2 rotor pumps (engine) / 1
rotor pump (transmission)
Primary transmission 33:76
Clutch Multidisc clutch in oil bath / hydraulically activated
Transmission ratio
1st gear 14:36
2nd gear 17:32
3rd gear 19:28
4th gear 22:26
5th gear 24:23
6th gear 26:21
Generator 12 V, 150 W
Ignition Contactless controlled fully electronic ignition with digital igni-
tion adjustment, type Kokusan
Spark plug NGK LKAR 8AI - 9
Spark plug electrode gap 0.9 mm (0.035 in)
Cooling Water, permanent circulation of coolant by water pump
Starter Electric starter/kick starter
13.1Capacity - engine oil
Engine oil 0.60 l (0.63 qt.) Engine oil (SAE 10W/50) ( p. 105)
13.2Capacity - gear oil
Gear oil 0.90 l (0.95 qt.) Engine oil (SAE 10W/50) ( p. 105)