fzs600 --> yzf600 engine swap??

[wraith600]

fzr & fazer same bore /stroke  been looking at this though wicesco used to do a big bore to 660 this is no longer available but a set of pistons from a 98/99 cbr600  is 65mm with the same pin of 17mm which gives 658cc might look closer over the winter if i can get the ash together