Abstract: In order to create a compact four-cycle internal combustion engine with mixture lubrication comprising a cylinder which is closed on top by a cylinder head and which changes below into a crankcase, in the cylinder a piston moving up and down, in the cylinder head an intake port with an admission valve and an exhaust conduit with an exhaust valve, a carburetor for forming an oil-fuel-air mixture lubricating the engine, as well as means by which a mixture is transported within each engine cycle from the carburetor into the crank chamber closed by the crankcase and from the crank chamber into the intake port, engine which is constructed in a simple way and which is characterized by a good charging behavior, it is proposed that the carburetor is connected outside the crank chamber with the intake port.