i'd like to know more about this stuff too. i just put a new OEM carb on my fa50. i've also mulled over the idea of using a different carb and getting rid of the oil injection...where have you seen performance parts? a couple years ago (before my ped's death and recent resurection) there was absolutely nothing for the fa50 anywhere except stock parts.
oh, and, hi! this is my first post.
_Kevin