Patent ID: 6892688

Claim:
An internal combustion engine, comprising: a cylinder having a combustion chamber and a cylinder housing; the cylinder housing having a cavity, an induction passageway supplying at least one combustion component to the combustion chamber; an exhaust passageway exhausting at least one combustion product from the combustion chamber, a venting passageway extending from the combustion chamber for venting the at least one combustion component from the combustion chamber; and a decompressor at least partially located within the venting passageway, the decompressor selectively opening and closing the venting passageway in response to a pressure in the combustion chamber; the decompressor being received within the cavity of the cylinder housing; and the decompressor including an expansible cavity operatively connected to the combustion chamber, the expansible cavity having an expanded position and a contracted position, the decompressor closing the venting passageway when the expansible cavity is in the expanded position, the decompressor opening the venting passageway when the expansible cavity is in the contracted position; the decompressor further comprising a valve housing; and a valve body moveably received within the valve housing, wherein the valve body has a first position corresponding to the contracted position of the expansible cavity such that the venting passageway is open and a second position corresponding to the expanded position of the expansible cavity such that the venting passageway is closed and wherein the valve body is slidably received within the valve housing; and the decompressor being releasably secured within the cavity of the cylinder housing by a cap.