It took a couple days to solve the furnace. I wanted to make sure the burner chamber was clean.
I had to:
1) disconnect the lines between the valve and the burner
2) unbolt the valve from the furnace housing and slide the assembly out
3) remove the wingnuts from the base of the burner chamber and drop it out
Because the orifice is right at the floor of the base, I found it was skinned over with a fine rust. A stripped sandwich bag tie actually cleared it out. It is important not to use anything that will scratch the orifice, but the twist tie in my opinion was very soft and required no force. A little compressed air and reassembly... a working furnace!
It took a couple days to solve the furnace. I wanted to make sure the burner chamber was clean. 
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