Rotax 503 Dual Carb Engine
503 ROTAX INFORMATION SHEET

50 HP DC at 6500 rpm 2-Cylinder, 2-Cycle, Oil Injected, Fan-Cooled

Block Only No Drive With "B" gearbox With "C" gearbox With "E" gearbox With "B" gearbox & elec. start With "C" gearbox & elec. start Operator's Manual (999-602) Operator's Man. CDI (999-606) Repair Manual (999-611) Repair Manual, CDI (999-600) Parts Manual (999-650) Parts Manual, CDI (999-605) Info Pak (999-668)

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SPECIFICATIONS
Bore:		72 mm (2.84 in.)
Stroke:		61 mm (2.40 in.)
Displacement:		496.7 cc (30.31 cu. in.)
Power output:		37.0 kW (50 HP)
Maximum rpm:		6800 for 1 min.
Direction of engine rotation:		Counter clockwise, viewed towards PTO
Cylinder:		2 light alloy with cast iron sleeves
Piston:		Aluminum cast with 2 piston rings
Ignition system:		Redundant breakerless Ducati capacitor discharge dual ignition with magneto generator
Generator output:		170 W AC at 6000 for 1 min. & 13.5 V RMS
Carburetor:		2 Bing 36 mm, hand lever or cable choke
Fuel pump:		Pneumatic fuel pump DF-44
Fuel:		Premium unleaded NOT BELOW MON 88 or ROM 90 (octane rating)
Lubrication:		2-stroke oil in fuel or oil injection
Mixing ratio:		50:1
Lubrication:		oil injected, mechanical lever