Ok, what I would do is easy big changes. First make sure you want to leave the lid off and have proper filter adapter to do so. With lid off in summer use a 280 main. Leave the pilot for now if it idles strong. Put the air screws 1 turn out to start. Move the clip on the needle all the way to blunt end . Try it. If it gets worse go with the clip all the way at the taper end. Clip changes are easy n free