Carb. Float issue

I have an issue where my float gets stuck and gas flows into my airbox, the only way to stop it is to turn the fuel off and wait until it drains...i took off the four screws on the top of the carb and moved the little needle thing around and put it back together and it seemed to work fine for an hour, then it died and i had to do the same thing again.

i have been told tons of times that the float is stuck but i have no idea where it is or how to get to it.
if anyone can help me out with a description or a pic that would be awesome. i appreciate any help that i can get.

thanks