Hey, so I recently got an ambex ym-2 second hand. For the life of me I cannot get all the burners to light. 1 will light in the middle, but the other 3 will not. I'm thinking I don't have enough gas coming in, or the burner orifice is clogged somehow. Any help or recommendations are welcomed. I have never roasted on an ambex and I'm slowly figuring stuff out.