A recoil starter featuring a capability of efficiently cooling an engine, easy fabrication and handlings of a power storage spiral spring and an enhanced assemblability is provided. The present invention also includes a method for photodynamic disinfection comprising applying the composition to a desired treatment area and applying light to the desired treatment area at a wavelength absorbed by the photosensitizer so as to inhibit Gram-negative organism located within the treatment area wherein the Gram-negative organism is receptive to paraben potentiation. Coextensively shaped top and bottom conductive clamps are coupled to the side face and spaced from the front face.