Patent ID: 6973899

Claim:
A stratified air, scavenged two-cycle engine comprising: a cylinder block having a cylinder bore therein defined by a cylinder sidewall, which has a scavenging port for fuel mixture delivery and an air port for fresh air delivery; a crankcase attached to the cylinder block and having a crank area to which the cylinder bore extends; and a piston located within the cylinder bore, the piston separating a combustion chamber of the cylinder bore from the crank area and being operably movable between a first position, in closest proximity to the crank area, and a second position; the air port and the piston being configured such that air may flow from the air port into the combustion chamber of the cylinder when the piston is at the first position; wherein the air port has an edge distal from the crank area that is contoured such that only a portion of the edge is exposed by the piston when the piston is at the first position.