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ENGINE 990 LC8 2007
Design
Liquid-cooled, 2-cylinder 4-stroke engine with 75° V arrangement with balancer shaft and electric starter
Displacement 999 cc
Bore / Stroke 101/62.4 mm
Compression ratio 11.5:1
Fuel unleaded fuel with at least RON 95 (USA: Premium RON 91) *
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 10W-50 (Motorex Power Synt 4T) #
Quantity of engine oil approx. 3 liters (0.8 USgal) during oil/filter change
Primary drive Straight-toothed spur wheels 35 : 67
Clutch Multi-disc clutch in oil bath
Transmission 6-speed claw shifted
Gear ratio
1
st
gear 14:36
2
nd
gear 16:30
3
rd
gear 20:30
4
th
gear 21:27
5
th
gear 23:26
6
th
gear 25:26
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