I've thought about installing a charcoal canister into my
Mikuni installation, purely from the standpoint of getting
rid of some the under hood gasoline stink after the engine
is shut off. Scavenging the waste fumes and using them to enrich
the mixture a little when starting could mean less choke needed
as well. I'd probably look for a new canister, since there are
parts on the old ones that could go bad, like the hot start valve.
I have no idea what part to pick, wish I could find someone who did.