mill the head, by a 15mm intake from motion left mopeds, mount a 15mm dellorto on it, mount a biturbo on it (requires exhaust header cut-and-weld), put better reads on your reed block (get the reed paper from treats hq). that's all anyone's figured out . . . though there are mythical batavus-bottom-end-with-a-scooter-top-end-that-just-happened-to-have-the-exact-same-stroke-parameters peds out there, or at least so i'm told.