I'm with @nick59
I would also add synching the carbs. When the carbs aren't synced properly the bike will run goofy; popping, missing, harder time starting, idle fluctuations, etc. It can be one, all, or a combination of those symptoms. Plus, they should be synced whenever a change is made to the air and/or fuel delivery systems. Synching the carbs is often overlooked, but can solve several problems.