Howdy Tim. Well, that's the weird part, on a yamaha board, a dude there posted the mikuni specs number from a haynes manual. When I googled the number, the only reference was back to that thread. I also looked up the part on a yamaha parts list from a schematic, again, nothing on a google search. I went to mikuni.com, sniffed thru a few of their distributors...again, nothing.
I'm thinking my next stop is at the local yamaha dealer, but figured I'd try here first.
Here's the numbers, btw:
mikuni specs # 4fp21-3
yamaha part # 1L9-14116-21-00