You may not need any change in jets. I put a K&N in the OEM air box, without changing anything -- it runs better, without issues, or changes to the carbs, compared to the paper filter. Mine is a '79 K, so your situation may be different.
If your bike has the constant velocity (CV) carbs, the general concenses is to only use the OEM air box back: the constant velocity (CV) carbs are very difficult to tune with pods.
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII