A pump-motor is used to move engine pistons to a position where the exhaust ports of a first cylinder are opened, and later to move the pistons to a position where the inlet ports and exhaust ports of the first cylinder are closed. A method for activating the surface of a base material in which the surface of a member to be treated is subjected to degreasing treatment or oxide film removing treatment. The generation laser produces a pulsed laser beam that is operable to induce ultrasonic displacements and thermal transients at the target material.