11-5
TECHNICAL SPECIFICATIONS – ENGINE 990 SUPER DUKE
Engine LC8
Design
Liquid-cooled, 2-cylinder 4-stroke engine with 75° V arrangement with balancer shaft and electric starter
Displacement 999.9 cm3
Bore / Stroke 101/62.4 mm
Compression ratio 11.8:1
Fuel unleaded premium fuel with at least RON 95
Valve timing 4 valves controlled over bucket tappet and 2 camshafts, camshaft drive with gears/chain
Valve diameter Intake: 38 mm Exhaust: 33 mm
Valve clearance, cold Intake: 0.10 - 0.15 mm Exhaust: 0.25 - 0.30 mm
Crankcase bearing Friction bearings (2 main bearings / 1 supporting bearing)
Conrod bearing Friction bearing
Piston pin bearing Dual-fuel bearing
Piston Light alloy – forged
Piston rings 1 compression ring, 1 taper face ring, 1 single-piece oil scraper ring with spiral-type expander
Engine lubrication Dry sump with 2 trochoidal pumps (pressure pump and suction pump)
Engine oil SAE 5W/40, 10W-50 (f.ex. Motorex Power Synt 4T)
Quantity of engine oil approx. 3.1 liters during oil/filter change or approx. 3.3 liters for dry engine
Primary drive Straight-toothed spur wheels 35:67
Clutch Multi-disc clutch in oil bath
Transmission 6-speed claw shifted
Gear ratio 1st gear 14:36
2nd gear 16:30
3rd gear 20:30
4th gear 21:27
5th gear 23:26
6th gear 25:26
Mixture preparation EFi (Electronic Fuel Injection)
Ignition system breakerless transistorized electronic ignition system with digital ignition advance
Ignition timing map-controlled
Generator 12V 450W at 6000 rpm
Spark plug NGK CR 8 EK
Electrode distance 0.8 mm
Cooling system liquid cooled, permanent circulation of cooling liquid through water pump
Cooling liquid 2.1 liters, 50% antifreeze, 50% destilled water, at least –25° C
Starting aid 0.9 kW electric starter
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