Engine for a vehicle

The invention relates to an engine for a vehicle, in particular a motorcycle, comprising a cam chain tensioner actuated by a pressure of lubricating oil for stabilizing the movement of a cam chain. The invention aims to provide an engine for a vehicle capable of effecting cost reduction and of securing a high pressure to a cam chain tensioner. Therefore, the invention proposes that a branched lubricating oil passage through which lubricating oil is supplied to the cam chain tensioner is provided, which is branched from a lubricating oil passage through which lubricating oil is supplied to a cam shaft located in a cylinder head.