Hi,

If the needle valve & seat are good, and the float level is set correctly it shouldn't leak. I have however noticed a few leaking if the bike is tiltled to one side too much [using bike kick stand]. A friend of mine has a '47 with an "H" motor and we have messed with the float, replaced the seat and shut off [needle valve], and it always manages to leak on the kick stand, but never otherwise.

Have fun,
Quenton