Flame on min to max double burner spreads out beyond the edges of my largest frying pan at any reasonable setting. Electrolux EW30GF65GSB. Flame from inner burner is yellow at most settings.

SOURCE: viking range - gas flame on one burner does not change

It sounds like the repair man was correct. The only variable is the valve, if the rest of the burners are fine then it will be the valve

SOURCE: yellow flame on the rear of my burner

Yellow is a "reducing" flame meaning low oxygen, whereas blue is an oxidizing flame. There is not enough air mixing with the gas. Clean out the pipes and free the air intake holes on the first stage of the burner assembly.

SOURCE: middle burner looks ok but has huge yellow flame

Sounds to me like the new burner that was put on, has the wrong gas orifice in it. Possibly a nat gas orifice instead of a propane orifice. If it's a propane grill, take it to your local propane co and have them look at it. Also, sometimes just a spiderweb or dirt dobber nest in the burner's venturi tube can cause that kind of problem. Blow it out with an air compressor and see if that's the problem.

SOURCE: The Miele KM326G cook top has 5 burners: 2 small

You could have a clog in your gas line. Have the gas company come out to check the pressure.

SOURCE: Our Uniflame Grill has a round outer burner and a

Bob, your wife is partially correct. However, both burners should have blue flames with orange tips. Cleaning the burners and the their venturi valves, should solve the problem. When I say cleaning them, I mean removing and cleaning them.

Hope this helped you and Happy Grilling!!