forget about looking for specific carbs , youl pay through the nose as the kit car boys are willing to pay over the odds
the daddies are mikuni rs smoothbores
its very unlikely to find em in this country though , even if you do they are costly
36mm will see you allreet
go for bikes that are unpopular
to sum it up
look for unpopular bikes
like steve says go for the biggest you can find , but size isnt everything
go for the newest carbs you can get , 1999 onwards ideally
mikuni or keihin ( but all oem carbs are of these manufactures )
buzz words to look for are smoothbore , flatslide , rs , fcr
this kinda thing
http://cgi.ebay.co.uk/MIKUNI-CARBURETOR ... dZViewItem
theres loads of info ont web , its a matter of doing the correct research
oh and when you have them in your hands , youl wonder why people still buy webers ( or so im told )
mwahahaha