Quote Originally Posted by BlitZ View Post
might sound stupid:
I guess the tappered bore must work by design as spoon utilises it.. at the very least it should not make things worst.

only reason i am completing a taper bore is b/c i would hate it if i lost the honda idle.. and I also dont want to replace the butterfly
i did my TB to 63mm and had the butterfly plate replaced,

my idle is fine, and have no problems at all...