There are two distributors for Mikuni America: Sudco and Carb Parts Warehouse. As 5twins says, all that sticker tells you is which distributor handled the carbies; they're sold with generic jetting, and for XS650 street tuning, every piece of brass except the float valves and the slides has to be changed. Re. the link, you need to register and sign in at XS650 Garage to get access to the VM Carb Guide; that's the only way we could establish read-only access and keep the reference threads from being turned into an unusable mess by every idiot who wanted to socialize and add his 2 cents worth of ignorance . Do yourself a favor and buy a copy of the Sudco Mikuni Tuning Manual; as I indicated in the introduction to the Guide, I don't believe in repeating information that's already available in print.