Stoves require a certain amount of oxygen to burn clean....there is an opening in your burner that is clogged up and not letting the required amount in....pull the lid off and start cleaning....
Each stove burner's flame color can be adjusted separately. The air shutter adjustment needs to be opened more, which allows more air to mix with the fuel. The shutter is located at the end of the burner tube. Once the shutter is adjusted correctly and all lint or dust is removed, there should be no yellow flames.
Also clean out the air shutter area, clear out up the burner tube and all the burner head holes or ports so flames are present completely around the entire burner. Some burners have ignition holes up one side of the burner head. Usually three or four small holes are used for burner ignition. If these holes are plugged or restricted, burners become slow to ignite or do not ignite. Clean out the holes with a pin but do not enlarge the hole. Enlarging the ignition hole will cause other problems, which cannot be fixed without replacing the entire burner.
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