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2 stroke engine cycle piston port the sliding piston closes and opens the intake and exhaust ports combustion power gas transfer transfer port exhaust air fuel mix piston connecting rod crankshaft carburetor compressed air fuel mix air fuel mix in a 2 stroke engine the piston cylinder and crankcase serve dual roles in developing power the piston moves downward after the power stroke pushing the air fuel mix below it up through the transfer port the incoming air fuel mix pushes out the burnt exhaust gas mixture from the combustion chamber as the piston moves upward compressing the air fuel mix in preparation for combustion a new air fuel mix enters the crankcase being drawn in by the upward motion of the piston expanding crankcase volume