[Dave W]

Only a guess based on a SOB we owned a few years back.



If the flame turns yellow, that means that there is too much air being admitted through the slot in the air/gas tube. I my case I was able to do some bending and twisting of thar tube so that when the burner heated up, it wouldn't expand past a given point. That adjustment is somewhat similar to the air/gas tube on the HW heater - too much air, sooty yellow flame, too little, it sounds like a 747 in take off mode