Wes - the biggest effect most people are after is to eliminate or reduce the slight bog that many bikes have when cranking open the throttle - going from zero to full throttle basically. With the R&D float bowl, you adjust the squirt duration/volume by simply turning the adjustable screw. The best way to do this is with the carb off the bike. Have gas in the bowl and the cables hooked up. Open the throttle as fast as you can and time the duration of the squirt and then adjust the srew to shortenor lengthen the time till it is about 3/4 to 1 second in duration.
Squirt timing is adjusted with the screw on the AP linkage as Grey said. You want to time the squirt so it just misses the slide on it's way up. The Zip Ty billet linkage stillallows you to make this critical timing adustment, however the Ready Racing
billet linkage does not - it screws the linkage together using the adjustment screw and locks it all together so it is non adjustable.
The R&D float bowl has other things it does supposedly, like keep the main jet supplied with fuel better because it helps to eliminate some of the sloshing around the jet, etc.,but again, the bigreason people like it is to help eliminate the bog - when tuned correctly.