In a 2-stroke gasoline engine, air-fuel mixture enters below the piston, into the crankcase.
The crankcase is sealed and fuel circulates through it as part of the fuel intake system.
To get the mixture to the combustion chamber, a third passageway called the transfer port is used. Incoming mixture enters below the piston, into the crankcase. The mixture is then transferred to the combustion chamber through the transfer port.
