Wot do pilot jets do...Exactly..?

[Steve3351]

Thanks for informations and thoughts. I now understand wot pilot screws do. That video with the Italian guy is good... My bike is STILL having throttle shut off delay...when I shut the throttle the revs don't go back to idle SMARTLY.
Changing the pilot adjustment screws didn't make any difference...so back to factory settings. Used WD40 and butane to check for air leaks...negative. Checked my sliders and diaphragms...all looks OK...still no difference. New throttle cables...STILL revs won't drop back after throttle shut off...
Anyone had similar issues......?? :wall