I just completed modifying my new Hurricane for NG. Works really well.
I drilled out the orifice tube that is protruding from the Hurricane valve. I have very low NG pressure and kept enlarging until I found a size that seemed to do what I wanted. The drill size I used was just barely smaller than the tube OD (sorry, didn't write the #value down). But when I drilled the tube, it came out. Apparently it had been screwed in and sealed or bonded with some type of compound and drilling caused it to fall out. Anyway the resulting hole is basically the threaded hole which was placed there by the manufacturer.
I also ran a slightly larger drill through each of the holes on the manifold. Yes all of them.... I did this primarily to ensure each was open. Several were not so this appeared to be worthwhile.
Setup was easy. I played with the air valve on the burner until I got a clean flame (all blue, which was hard "not" to get) and a good idle at low throttle...
. Suggestion, don't skimp on the feed hose diameter. The low pressure on house NG needs a low restriction feed to get the BTU's out.
The only thing I did to the burner other than the above was to weld some pot supports on the top ring. I've got a 60 L SS pot and it just barely sits on the top ring which just happens to be the same diameter as the pot. Anyway, this wasn't really mandatory but my pot sits with greater stability now.
This thing cooks... I think I could heat our 3 car garage with it full on. Dead quiet also. Now, let's see, where's that next AG batch at...