I'm more concerned about the fuel delivery right now, just back out the mixture screw to 1 1/2 turns for now and sort out the fuel delivery, there are often 2 screens, one is inside of the tank and will need the tap to be unscrewed off to get at it, the other is often inside of the bowl of the tap isnt there a hexagon 10mm at the bottom of the bowl?
*** IMPORTANT***
Always use a 6 point socket here unless the bowl comes off easily, dont force it or you'll risk rounding off the soft metal