Easy to change the needle, remove the float bowl while the carb is upside down. Reason, on most floats there's a tiny rod that holds the float in place, next you can remove the needle from the float, there's usually a small clip that holds it in place. Assembly in reverse order. Where the needle goes in, you should see a very small rubber "O" ring that the needle seats against. when you change that out, pay attention to the in/out direction, one side may have a circular ridge. If you but it in backwards, the needle may not seat properly. When you put the float bowl back on, careful not to pinch the seal. I've left a plethora of blue streak curses in the garage the first time I did one. So far I've done the gas auger, chainsaw, weed wacker, a few outboards and a few lawnmowers.