ENGINE

原文（中文）

An engine in which a decompression mechanism is simplified includes an engine block, a cylinder chamber inside the engine block, and an extension space inside the engine block and extending laterally from the cylinder chamber. The engine also includes a decompression valve installation hole in the engine block in a portion of the extension space, a decompression valve arranged to advance and retreat with respect to the decompression valve installation hole, and a decompression valve advancing/retreating mechanism to cause the decompression valve to perform an advancing/retreating operation.