Abstract: A two-stroke axial engine in which the inlet of fresh mixture is effected directly in a scavenging chamber through an aperture actuated by the primary shaft, the fresh mixture being thereafter exhausted under the control of the piston from the scavenging chamber through scavenging apertures into a combustion chamber, and between the scavenging chamber and the crankcase there being mounted a separator, and a fork mounted on an oscillator and slidable on a guiding rail pivotable on two bearings.