How to Adjust the Flame on Your Gas Range. A pilot flame that's too high will damage your cooktop. If it's too low, you'll have to relight it frequently. Here's how to adjust it so it's always just right.
Find the tube that feeds the burner. There's a burner air adjustment on it that mixes the air and gas.
Look to see what type of burner air adjustment you have: It will either be a barrel-shaped chamber or triangle-shaped with a cover plate.
Loosen the air-shutter screw on the barrel-shaped type. This screw is on the end of the barrel closest to the burner.
Open the shutter on the barrel-shaped type by turning it counterclockwise; close it by turning it clockwise. Opening it will add more air, which will make the flame higher; closing it will reduce the air in the mix and lower the flame.
Loosen the screw holding the plate on the triangle-shaped burner air adjustment. Don't remove the screw - it just needs to be loose enough to move the plate.
Move the plate so that the opening is either more open or more closed. More open will make the flame higher whereas more closed will lower the flame.