An engine comprising: a cylinder having a plurality of fins at an outer circumferential section thereof and in which a combustion chamber is formed; a cooling fan installed at one end of a crankshaft and configured to generate cooling air to cool the cylinder ; and a muffler attached to an exhaust opening of the cylinder , wherein an exhaust gas outlet is installed at the muffler , an exhaust gas restriction member configured to determine a discharge direction of exhaust gases is installed at the exhaust gas outlet , and the exhaust gas restriction member is configured to have two exhaust passages arranged in parallel such that exhaust directions of the exhaust gases are spaced apart from each other, wherein the exhaust direction of the exhaust gas is configured to allow the exhaust gas to flow along an outer surface of the muffler , and the exhaust gas flows from an opening of the exhaust passage to an end surface of the muffler to be discharged into the atmosphere, wherein the exhaust gas restriction member is configured to hold a spark arrester installed at the exhaust gas outlet , and the exhaust gas passing through the spark arrester is discharged through the exhaust passage, wherein the exhaust gas restriction member is manufactured by press working of a metal plate, wherein each exhaust passage is a convex section formed by press working, and an opening is formed in an end portion of the convex section, wherein some of the cooling air is introduced in the exhaust direction of the exhaust gas of the muffler , wherein the exhaust gas passages have a shape that is narrowed such that the cross-sectional area is decreased from an inflow side to a discharge side of the exhaust gas, and opposite wall surfaces that are two wall surfaces opposite to each other are disposed obliquely. a cylinder having a plurality of fins at an outer circumferential section thereof and in which a combustion chamber is formed; a cooling fan installed at one end of a crankshaft and configured to generate cooling air to cool the cylinder ; and a muffler attached to an exhaust opening of the cylinder , wherein an exhaust gas outlet is installed at the muffler , an exhaust gas restriction member configured to determine a discharge direction of exhaust gases is installed at the exhaust gas outlet , and the exhaust gas restriction member is configured to have two exhaust passages arranged in parallel such that exhaust directions of the exhaust gases are spaced apart from each other, wherein the exhaust direction of the exhaust gas is configured to allow the exhaust gas to flow along an outer surface of the muffler , and the exhaust gas flows from an opening of the exhaust passage to an end surface of the muffler to be discharged into the atmosphere, wherein the exhaust gas restriction member is configured to hold a spark arrester installed at the exhaust gas outlet , and the exhaust gas passing through the spark arrester is discharged through the exhaust passage, wherein the exhaust gas restriction member is manufactured by press working of a metal plate, wherein each exhaust passage is a convex section formed by press working, and an opening is formed in an end portion of the convex section, wherein some of the cooling air is introduced in the exhaust direction of the exhaust gas of the muffler , wherein the exhaust gas passages have a shape that is narrowed such that the cross-sectional area is decreased from an inflow side to a discharge side of the exhaust gas, and opposite wall surfaces that are two wall surfaces opposite to each other are disposed obliquely. <EOS>