Alright, I have a one speed puch polini with some port matching done. I did not however do the top ports, I have heard that this can affect the top end in a negative manner, but affect the mids and make it crazy fast in the mid range. Is it bad to run a polini without the top porting done? Will doing the top ports slow you down on the top end? How far should you go back on both the transfer ports and the top ports....to the depth that the stock transfer ports? Can anyone post a picture of a good ported case to match the polini for the puch, and finally..what type of race crank should I get, I saw the post about the new crank in SF go after only like 1000 miles. Thanks.