I too am having a simular problem. This is my first year with my BioMass. I have never seen blue flames in my gassification chamber. My wood has 15-20% moisture but my understanding is this acceptable. I am having a hard time figuring the proper adjustments on primary, secondary, and fan speed. I get yellow/orange flames in the gassification. and my smoke outside seems a bit yellow. Is a blue flame really possible? I certainly have never seen it. Thanks for any tips on tweaking this thing. I feel like right now I am burning through a lot of wood and winter hasnt really arrived yet.