for a two cycle internal combustion engine is disclosed which comprises the steps of forming bulged portions protruded radially outwardly in a portion of a cylindrical liner and surrounding the liner by casting through a high pressure diecast method thereby form a main part of the cylinder application_number US 33973989 A description the present invention will now be described by way of example with reference to the accompanying drawings in an embodiment shown in fig1 for producing a cylinder 1 a cylindrical liner 2 which has been provided with an intake port 20 and an exhaust port 21 in advance is first prepared the liner 2 may be formed of aluminum alloy high silicon aluminum alloy sintered metal iron and any other suitable material one or more bulged portions 3 are bulged radially outwardly a c shaped in cross section in the longitudinal or axial direction through a bulge working in the liner 2 in this embodiment the two bulged portions 3 are provided so as to face each other in a diametrically opposite relation with respect to the liner 2 the liner 2 that has been thus provided with the bulged portions 3 in advance is disposed in place in a high pressure diecast machine the liner 2 is surrounded by casting with aluminum alloy through the high pressure die casting method as a result the cylinder main part 4 of aluminum alloy is formed the liner 2 and the cylinder main part 4 are integrally bonded with each other to form the cylinder 1 the thus produced cylinder 1 is provided with a piston not shown being slidable in the liner 2 when the cylinder 1 is assembled into the two cycle internal.