In a two-stroke engine including a scavenging port (43b) having an open end (42d) opening out in a side wall of the cylinder bore (3a) and communicating with a crank chamber (2a), the open end being configured to be closed and opened by the piston (22), a fuel injection device (71) is mounted on the engine main body so as to inject fuel onto a back side of the piston and/or a part of the side wall of the cylinder bore located under the piston via the open end of the scavenging port or via the open lower end of the cylinder bore. The fuel deposited on the surfaces of the piston and the cylinder inner wall promotes the cooling of such parts.

In a two-stroke engine including a scavenging port (43b) having an open end (42d) opening out in a side wall of the cylinder bore (3a) and communicating with a crank chamber (2a), the open end being configured to be closed and opened by the piston (22), a fuel injection device (71) is mounted on the engine main body so as to inject fuel onto a back side of the piston and/or a part of the side wall of the cylinder bore located under the piston via the open end of the scavenging port or via the open lower end of the cylinder bore. The fuel deposited on the surfaces of the piston and the cylinder inner wall promotes the cooling of such parts.

A two-stroke engine has a cylinder in which a piston is mounted in a reciprocating manner. The piston delimits a combustion chamber in the cylinder. An air channel leads out at a cylinder bore of the cylinder via a channel opening. A transfer channel leads out at the cylinder bore via a transfer window and fluidically connects the crankcase interior to the combustion chamber in the region of the bottom dead center of the piston. The piston has a piston pocket connecting the air channel opening to the transfer window at least in the region of the top dead center. To ensure a sufficient fuel supply, the piston pocket has at least one section configured and arranged such that, during the downward stroke, a fluidic connection between the piston pocket and the air channel opening exists down to a crankshaft angle of at least 40 before bottom dead center.

A two-stroke engine has a cylinder in which a piston is mounted in a reciprocating manner. The piston delimits a combustion chamber in the cylinder. An air channel leads out at a cylinder bore of the cylinder via a channel opening. A transfer channel leads out at the cylinder bore via a transfer window and fluidically connects the crankcase interior to the combustion chamber in the region of the bottom dead center of the piston. The piston has a piston pocket connecting the air channel opening to the transfer window at least in the region of the top dead center. To ensure a sufficient fuel supply, the piston pocket has at least one section configured and arranged such that, during the downward stroke, a fluidic connection between the piston pocket and the air channel opening exists down to a crankshaft angle of at least 40 before bottom dead center.