If it was a 4 stroke, the "lip" might be there to stop burnt exhaust gas being drawn back into the cylinder. But, being a 2 stroke you could almost run the engine on what comes out of the exhaust as there is a lot of unburnt fuel going staight through the engine and hence the need for an exhaust expansion chamber to reflect it back in. The bottom of the port wont affect the timing, only the size of the hole and therefore the amount of gas flowing through. Has anyone out there matched the bottom of the port with the piston crown at b.d.c.? Noticed any difference in engine performance?
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