A two stroke combustion engine comprising: at least one combustion cylinder having a cylinder center axis, a combustion piston movable within the combustion cylinder, the combustion piston having a first compression direction along the cylinder center axis, a closed crankcase sealed off from the combustion cylinder and from transfer channels by the combustion piston, at least one separate piston pump having a piston pump cylinder with a piston pump center axis and a pump piston movable within the piston pump cylinder, wherein the separate piston pump is in syncronized movable mechanical connection with the combustion piston, and an air inlet having an air inlet center axis, wherein: the separate piston pump, the air inlet and the combustion cylinder are in fluid connection with each other by a transfer channel, the piston pump center axis intersects a cylinder plane (X-19) extending from the cylinder center axis, and the intersection defines a starting point of a ray extending from the intersection in the first compression direction, and a normal axis extends perpendicularly from the cylinder plane (X-19), the normal axis intersects the piston pump center axis, characterized in that the pump piston has its compression direction towards the plane (X-19), and towards the intersection in the combustion cylinder, and wherein an angle, measured between the ray and a point on the piston pump center axis, located in the piston pump cylinder, is between 30° and 160°, wherein the movable syncronized mechanical connection between the piston pump and crankshaft comprises at least one of: a belt drive, gear drive and a chain drive and/or wherein the movement of the combustion piston and the pump piston is synchronized by means of at least one of; an electrical motor, an electrical solenoid, a hydraulic motor, a hydraulic solenoid, an air motor, an air solenoid or a combination thereof. at least one combustion cylinder having a cylinder center axis, a combustion piston movable within the combustion cylinder, the combustion piston having a first compression direction along the cylinder center axis, a closed crankcase sealed off from the combustion cylinder and from transfer channels by the combustion piston, at least one separate piston pump having a piston pump cylinder with a piston pump center axis and a pump piston movable within the piston pump cylinder, wherein the separate piston pump is in syncronized movable mechanical connection with the combustion piston, and an air inlet having an air inlet center axis, wherein: the separate piston pump, the air inlet and the combustion cylinder are in fluid connection with each other by a transfer channel, the piston pump center axis intersects a cylinder plane (X-19) extending from the cylinder center axis, and the intersection defines a starting point of a ray extending from the intersection in the first compression direction, and the separate piston pump, the air inlet and the combustion cylinder are in fluid connection with each other by a transfer channel, the piston pump center axis intersects a cylinder plane (X-19) extending from the cylinder center axis, and the intersection defines a starting point of a ray extending from the intersection in the first compression direction, and a normal axis extends perpendicularly from the cylinder plane (X-19), the normal axis intersects the piston pump center axis, characterized in that the pump piston has its compression direction towards the plane (X-19), and towards the intersection in the combustion cylinder, and wherein an angle, measured between the ray and a point on the piston pump center axis, located in the piston pump cylinder, is between 30° and 160°, wherein the movable syncronized mechanical connection between the piston pump and crankshaft comprises at least one of: a belt drive, gear drive and a chain drive and/or wherein the movement of the combustion piston and the pump piston is synchronized by means of at least one of; an electrical motor, an electrical solenoid, a hydraulic motor, a hydraulic solenoid, an air motor, an air solenoid or a combination thereof.