Fastening device for two-cycle motor

The two-stroke engine has a cylinder (20) which is provided at transfer channel for connecting the interior of crankcase of engine with the combustion chamber (27). The cylinder has an axial bore (50) which partially penetrates the wall of outlet channel (16) and/or the overflow channel, so that the hole in the outlet channel and/or the overflow channel forms wall-side aperture. A pin (40) is arranged in the bore to seal the wall-side aperture so that the original surface of wall of the outlet channel and/or the overflow channel is formed again in the region of wall-side aperture.