Importance

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Abstract

A two-cycle engine having an enclosed crankcase assembly and a cylinder assembly. A cylinder wall is sized to sealingly cooperate with the piston as it reciprocates relative thereto. The cylinder assembly is provided with an exhaust port in a first plane and a pair of diametrically opposed recessed transfer ports positioned in a second plane along the cylinder axis. The cylinder assembly is provided with a pair of decompression slots each formed in the cylinder wall in communication with one of the opposed transfer ports and extending towards the combustion chamber end of the cylinder assembly. The decompression slots having a circumferential width W which is substantially constant and a radially measured depth D which varies generally linearly from a maximum depth at the intersection of the decompression slot and the transfer port to a minimum depth at the uppermost end of the decompression slot.

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First Claim