Thank you, I appreciate the info. Lot of stuff out there on propane, but this is the only instruction on natural gas I have been able to find. I made up three nice burners like I have made for propane and all I got was a lazy curled up flame. I found an old variable speed forge fan and will try out a 1/4" orifice in a pipe quick and dirty and see what happens.
So, you increased the gas orifice hole size from 1/8" to 1/4" ? I have 1/8" on mine now and it does not work well and I was just thinking about increasing it to 1/4". How long of flame does that give you?