High 1 1/2 turns out
Low 1 1/4 turns out
Start by turning both needles all the way in (Clockwise) As soon as you start to feel resistance stop turning the needle. If the needle is turned in to far you can damage the needle. Turn the high screw out 1 1/2 turns and the low 1 1/4 turns. To determine the high from the low needle you will find an "H" and "L" above the two needles