That port taped off is on the right carb, is a vacume port to operate the Air baffles, (lets air into exaust, suppose to help on decell from popping. Blocking that off like that is a easy way to do so called Marbling! The screw beside it is the adjustment, normally about 2&1/2 turns out from bottom
04-3,200 miles bought July 2011 with 928 miles. Loaded with acessories to many to list here, see my albums for more details! I also make a custom tank bib specific for the 750 if anyone is interested, ck my albums for some pics.