TOPIC:

On my 77 Kawa I removed the baffle because my sons ride with me and wanted more obnoxious noise.

As a rule of thumb - if there is such a thing - would that require a larger main jet or pilot.?

Stock jetting on my Mikuni VM24s is 102.5 Main, 15 pilot. I was told that I should increase the Main up to sizes to 107.5 to accommodate the removed baffle.

Thoughts on this are appreciated

You'll lose power in the top end.
Steve

There is no magic formula, but you need to go up on both circuits at least one size, and then up in increments of one at a time on each circuit separately until you get there, also you may have to raise or lower or even shim the jet needless, everything else such as valve lash, ignition timing, cam chain adjustment need to be correct also, all this needs to be done if you are going to do the job properly.

Kevski is right, no magic formula but a dyno will take some of the trial and error out of it.
PS you have mail Kev.

Thinking it would defently be too lean with the jets you have and mine with different carbs 24s and 29mm smooth bores and playing with the jetting never seemed to run quite as good as with the baffle in. Too Easy to piss off the cops and folks in your area too.