I have the stock airbox setup but it seemed to run better with the open filter. I got a bigger 6" Uni filter and it did help a little but its still rich. I guess I'll keep playing around with the jetting. Since I have a decent idle, should I change the main or the pilot jet? And I also, I have been reading other's posts where they are mentioning the air screw, I thought this was for how fast the bike idles down after letting off the throttle but it seems people are stating as it assists in jetting.