ORIGINAL: JIMARRINGTON
However, Your suggestion of smoothing the blunt end on the transfer port runners looks like it has merit. I would only worry about how the heat would affect it if it was too skinny.
Jim
I would think that area of the cylinder would run pretty cool what with the cool intake charge flowing by it and it being pretty far away from the combustion chamber. I only rounded off the blunt edges of the runners at the port entrance but did not touch beyond a few mm into the port.
It is true that there is only a little material that needs removing to match up the older crankcase with the newer bifurcated transfer port cylinder. Cutting away the integral fan shroud does take some time.
diceco