Was just trolling the net and looking at carb jets.
Have seen here (I think) some asking for a jet size comparison between Mikuni and Keihin.
When I was on the Jets-R-Us web site there was a link called identify that jet.
I was amazed at how many "styles" of main jets there were for Keihin and Mikuni.
Counted 24 different styles of mains for Keihin and 7 different styles for Mikuni.
So I am not sure if the charts you find on the net are accurate. The one I found seemed way off
compared to what I run. The chart showed Keihin jet numbers larger than Mikuni yet when I switched
from Keihin to a Mikuni carb on my oddy I run a much bigger Mikuni jet in comparison.
Here is the link: http://www.jetsrus.com/FAQs/FAQ_identify_that_jet.htm
Look under the jets tab to see the styles.
Just thought I would share, feel free to shoot at me if I am wrong, I'm wrong a lot LOL.

something to consider when getting jets, if it's for Keihin, make sure it has the trade make "K" otherwise the jet you buy may not perform like you expect. I always use the trade marked product, it's a little more $, the issue with the off brand, I have never personally experienced but have heard this from several sources, some even reliable!