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[DaveS]

I've used my 10-jet NG burner only a few times and last night I was boiling some peanuts rather than wort. I noticed that some of jets weren't burning quite right. One had small flames coming from where the brass jet screws into the base, a couple of others had flame down in the "box" at the base where the air inlets are located. A couple others were burning with yellow flame. I tried to tighten a couple of jets but couldn’t stop the base flames. So after I turned it off and let it cool, I put it on my workbench. Every jet was screwed in barely finger tight. No wonder there were flames in the thread areas.So I removed them all (1/2" wrench), wire brushed the threads and the holes they screw into. Then I ran a #57 drill bit through each orifice. Two were partially clogged. Then I took the gas supply hose off and blew air from my compressor through everything to clean out any crud. Before reassembling, I coated the threads of each jet with pipe thread sealant, available at any hardware store. The brand I used is Rectorseal 5, which comes in a small tube like toothpaste comes in. In fact, the stuff looks like yellow toothpaste. Make sure not to put too much on and block any of the openings. After reinstalling the jets, I tightened them firmly, but not too much so. On the next use, everything burned perfectly. Clean blue flames where they should be. I let it cool again and all were still tight. Then I backed off a couple of the jets to make sure the pipe thread compound didn’t harden and lock things up. It didn’t.So for those of you using NG ring burners with multiple brass jets, you might want to do a bit of cleaning and tweaking to maintain a clean burn. I think what I did would work on any burner with similar jets. I attribute my problems to the fact that the jets weren't properly seated and sealed when manufactured.Hope this helps.