| 摘要 |
Engine comprising at least one valve (100,114) movable between an open position and a closed position, wherein a combustion chamber (54) is open when the valve is placed at the open position, a camshaft (122R,122F) having a cam portion (144a,144b) to actuate the valve, a decompression member (202,300) disposed on the camshaft and being movable between a first position and a second position, wherein a portion of the decompression member generally places the valve at the open position when the decompression member is placed at the first position and releasing the valve from the open position when the decompression member is placed at the second position, a regulating member (204) disposed on the camshaft and regulating the decompression member to the first position when the regulating member is placed at a third position and releasing the decompression member from the first position when the regulating member is placed at a fourth position, and a bias member (206) arranged to urge the regulating member toward the third position, wherein the regulating member is movable toward the fourth position against the urging force of the bias member when a rotational speed of the camshaft exceeds a preset speed.
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