engine, the oil and fuel must be mixed in the fuel tank on  some models. Other models use a lubrication system, such  as the 503 oil injection lubrication system. This system does  not mix the fuel and oil as the oil is stored in a separate tank.  As the engine needs lubrication, the oil is injected directly  from this tank. The typical ignition system is a breakerless  ignition system with a dual ignition system used on the 503,  and a single ignition system used on the 447 engine series.  Both systems are of a magneto capacitor discharge design.  The engine is equipped with a carburetion system with one  or two piston-type carburetors. One pneumatic driven fuel  pump delivers the fuel to the carburetors. The propeller is  driven via a flange connected gearbox with an incorporated  shock absorber. The exhaust system collects the exhaust  gases and directs them overboard. These engines come with  an integrated alternating current (AC) generator (12V 170W)  with external rectifier-regulator as an optional extra.  The Rotax 582 is a two-stroke engine, two cylinder inline  with rotary valve inlet, has liquid cooled cylinder heads and  cylinders that use an integrated water pump.  [Figure 11-3] The lubrication system can be a fuel/oil mixture or oil  injection lubrication. The ignition system is a dual ignition  using a breakerless magneto capacitor discharge design. Dual  piston type carburetors and a pneumatic fuel pump deliver  the fuel to the cylinders. The propeller is driven via the prop  flange connected gearbox with an incorporated torsional  vibration shock absorber. This engine also uses a standard  version exhaust system with an electric starter or manual  rewind starter. Two versions of air cooling are available for these engines.  The first method is free air cooling, which is a process of  engine cooling by an air-stream generated by aircraft speed  and propeller. The second is fan cooling, which is cooling  by an air-stream generated by a fan permanently driven from  the crankshaft via a V-belt.  Engine cooling for the Rotax 582 is accomplished by liquid  cooled cylinders and cylinder heads.  [Figure 11-4]  The  Description of Systems for Two-Stroke Engines Cooling System of Rotax 447 UL SCDI and Rotax  503 UL DCDI Cooling System of the Rotax 582 UL DCDI  Rotax 582 UL DCDI  0 30 10 20 40 50 Temperature C° 1 10 11 13 6 12 8 3 14 7 9 4 2 5 1 2 3 4 5 6 7 8 9 10 11 12 14 13 Cooling liquid Crankcase Cylinder Cylinder head Water pump Radiator Hose from radiator to water pump Hose from cylinder head to radiator Radiator screw cap, with excess pressure valve and return valve Temperature gauge for cooling water Overflow hose Overflow bottle Bottle venting Expansion tank Cylinder head venting hose Figure 11-3.  Rotax 582 engine.  Figure 11-4.  Rotax 582 cooling system. 11-5