Hi chris125,
Just out of curiosity, what oil was used and how much work has the saw done?
Nice photo of the top of the piston, the books I have say misaligned transfer ports for that effect..
Edit: FYI just did a little more research on that the pattern on the top.. is called a "Jante" velocity pattern, named after Alfred Jante in about 1968, looks like an SAE Paper was written on it (Jante, 1968, SAE 680468)
Light holiday reading....