Check out the Gearing Commander. This is a calculator for motorcycle gearing/sprockets. Check it out if you want to try a combo without buying your sprockets first.

The bone stock gearing for the 14 is already in the database so you can mess with different sprocket combos.

http://www.gearingcommander.com/

They are close.. but not right.

for example, with my 16/45 combination it says i can run (just remembering off the top of my head) 157 in 5th gear at 10,800 rpm. But i know for a fact the bike will only run 148.