I did think they made smaller.A thin-wall 3/8 13mm socket should get that out IMO. I'm sure thats how it ended up in there.
Thanks couldn't remember what order they came off, took so long for the powder coating to get done I forgot.Here you go. All the info you ever wanted
http://www.mikuni.com/pdf/sbn_rebuild-kit.pdf
http://seadoosource.com/mikunitests.html
http://www.mikuni.com/pdf/sbn_manual.pdf