I have a Blichmann burner but I would imagine that it runs on the same principal. I turn the gas down with the regulator and fine tune with the air damper. If the flame is yellow, there is not adequate air and you will need to increase the air flow. As you increase the gas flow via the regulator, it may be necessary to readjust the air damper. It took me a few batches to figure out how to reduce and increase the flame properly (without the flame being yellow).