What should I do if the engine of Yang Guang rowing boat 250 leaks oil?

Replace the cylinder head cover for maintenance. The oil leakage in the small hole of the engine of Yang Guang rowing boat 250 is due to the loosening of the screw in the oil hole, which can be solved by replacing the cylinder head cover for maintenance. An engine is a machine that can convert other forms of energy into mechanical energy, including internal combustion engines, external combustion engines, jet engines, motors, etc.