piston 1 can have one or more piston rings which are preferably arranged such that at bdc these come to contact the running surface 2 above the combination seal according to the shown configuration it is possible to provide a two stroke combustion engine with a transverse scavenging system which has the crankcase not shown in more detail sealed by the seal assembly 3 arranged in the running surface 2 fig4 shows a second configuration of a two stroke internal combustion engine here an overflow channel 15 is provided from which exhaust gas can flow into the oil chamber shown as a cutout or into the crankcase 16 for example the piston 1 can have a piston ring while the running surface 2 has two combination seals 3 while the first seal assembly 3 1 is arranged underneath both ports the second seal assembly 3 2 is arranged between the intake port 12 and the exhaust port 14 in this way it can be guaranteed that an additional seal is provided which prevents blow by from the intake port into the exhaust port of the two stroke internal combustion engine alternatively only one of the two combination seals 3 1 3 2 can also be provided here however then there is at least one preferably two piston rings on.