There are two ways to tell whether the jet is correct. A dyno and exhaust gas analyzer is the best - and also quite expensive as jetting changes take time and you pay for the time you tie up the dyno. Doing plug chops is less exact but quite effective (and free unless you get speeding tickets). Do one full throttle check on all four plugs to make sure you aren't so lean that melting a piston is likely, then work on the cylinder with easiest access to the bowl screws. Get the main jet correct for a tan plug after 30 seconds or so WOT in top gear above 4-5000 RPM: doing the one carb saves the time of removing the carb bank for jet changes if you can get the bowl off and change the main with the carbs installed. Next install all 4 mains... you'll get good at pulling and replacing the carb stack soon. Check WOT on all four, just to confirm the jet choice. Next do 3/4 throttle and 1/2 throttle and 1/4 throttle chops, record the plug colour. If they are all rich, raise the needle clips one groove (or shim if there aren't grooves). If all lean, drop the clips (SOL with single grooves). If the chops get richer towards 1/4 throttle, use a smaller pilot jat and check again.
Idle is not completely a pilot jet issue - you can get a good idle within quite a wide pilot jet range using the idle air/Fuel screw.
It may seem strange, but with K&N pods and a free flowing exhaust, a one size smaller than stock pilot jet is usually needed.
