There are a fair few 14 tyres but you gotta look for them under scooter tyres.. 14" is the harder one to find but i found a fair few on
http://www.americanmototire.com/ use the the site as a referance and goto a local shop , thats what i did when chasing some wide 10" semi slicks. Went in with a list of tyres to try and ended up with a really good set.
PIRELLI GTS23 120/80-14 FRONT (OEM HONDA SILVERWING)