There is a black screw on the carb. Is that the screw that chooses the amount of fuel? If so what is the correct setting as in how many turns? Thanks

The black screw is the idle speed screw, the large aluminium knurled 'wheel' is for air/fuel idle mixture adjustment on the 2008 model Rev 3...

And there is no absolute exact setting, if there was there would be no reason to make it adjustable

Idle speed is quick and simple enough

The air screw is probably near 1.5 turns out, it's a sensitive adjustment but set the highest idle speed possible, start with full turns either way and listen carefully for changes in idle speed, then half turns, then quarter turns

Make sure the engine is at full operating temp and you may need to adjust it from time to time with altitude and temp