Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Looks like you've just got a straight swap to K7 carbs complete with jets then. It doesn't look much of a problem as Honda were chasing horsepower figures on the F2 in competition with other manufacturer bikes that were coming onto the market at the time. It's setup to run higher rpm peak than K7 which was orientated towards slower cruise style riding. You can assess the running once you get it going competently. Carb rubbers, I'd not be encouraged that there is much of any choice regarding replacement and if not fixed they will run you raggedy with setup problems. Maybe some of the F2 owners on here could point out any other route for this. I know what the choke / throttle lift does but don't have example to look at right now. Manual drawings don't show exact details of that screw but do request greasing of that part for assembly and maintenance. Presumably the screw replacement would reinstate the lift function, so worth considering. It's not a show stopper if the throttle doesn't lift, it just means it won't reliably run during choke phase while cold starting so you'll just have to modulate revs yourself to avoid stalling. It should ride fine otherwise, as choke flaps will make it respond ok to riding. In reality when they were new you'd want to get it off choke as soon as possible as riding at slow speed the elevated rpm use wanted to push it along too fast.