A combustion engine having a crankcase and a cylinder, wherein a piston is guided to be movable in strokes inside cylinder, piston movably limiting a combustion chamber, and wherein in cylinder at least one transfer port is inserted, which extends between crankcase and combustion chamber, and through which an ignition mixture can flow from crankcase into combustion chamber, and which opens out into combustion chamber in an upper discharge area in such a way that ignition mixture preferably does not reach transfer ports and thus the crankcase, while at the same time a direct connection of crankcase to combustion chamber is maintained via a transfer port, which is as short as possible, it is suggested that at least one storage chamber is provided which is connected to upper discharge area and in which exhaust gas flowing from the combustion chamber into discharge area can be temporarily stored.