dirtdigger

Hi, I have bought a CB750k1 1971 US Model, I have not ridden the bike yet! But have noticed after commissioning the bike that there is a leak from carb on cylinder 1, I think it is assembly A. I believe the part number is 16100300024. I believe the part is obsolete, do you know how I might be able to get a replacement or identify the root cause, we have tried everything. Thanks