Float bowls on carbs, resemble toilettes, sometimes the toilette components stick, and that sucker keeps a running, so ya jiggle the handle, in this case, it could be a needle valve, the needle, or the seat could be worn out, replace those. Usually the float tap for its height dosnt change unless you physically change it. Leave it be. next make sure you aren't clogged with crappy ethynol gas. It quickly leaves crap in your fuel system than any fuel I have seen in the past. Drain that cheap crap out and find you some good non ethynol fuel, you will be surprised! LOL! Crappy gas sums it up!