| 摘要 |
A valve-actuating system for an engine, in which left and right rocker arms are moved in axial directions of a rocker arm shaft to one of a first operating position in which the rocker arms are allowed to abut on first cams, and a second operating position in which the rocker arms are allowed to abut on second cams. The rocker arm shaft is slidably supported by an engine frame so as to be movable in the axial directions thereof. During an engine operation, when the left and right rocker arms are about to be selectively moved to one of the operating positions, the rocker arm shaft is moved in advance to the same side of the selected one of the operating positions, and thereafter the left and right rocker arms are moved to the selected one of the operating position.
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