The float tang is adjustable. It has obviously been adjusted before. Maybe several times. Adjustment of the tang on the float sets the level of fuel in your bowl. If it has been halfway up the sight window in the last few weeks I wouldn't mess with it. As I recall you were having problems with the engine running without the choke. When cleaning the carb, pay special attention to the idle circuit. Pull the ICS and blow out and snake out with wire (if you can) all the nooks and crannies related to that part of the carb. Hopefully you'll put your carb troubles to rest. Good luck!