Abstract: In a reed valve of the type having a base formed with one or more apertures through which flows a fluid, a shock absorbing seat attached to the upper surface of the base so as to surround the one or more apertures at the inner peripheral edge thereof, and a reed having one end securely fixed to the base, whereby the reed is forced to move to seat on the seat, thereby closing the one or more apertures and to move away therefrom, thereby opening the one or more apertures, at least a portion of the inner peripheral edge of the seat which engages with the free end portion of the reed is spaced outwardly away from the upper edge of the aperture by a suitable distance and is beveled or curved.

Abstract: An ignition timing control device comprising a vacuum advance mechanism of the type controlling the ignition timing in response to the negative pressure in a carburetor, a negative pressure line between the carburetor and the vacuum advance mechanism, and a thermostatic valve for opening the negative pressure line to the surrounding atmosphere only when the temperature of an engine is within a predetermined temperature range.