What does rich lean mean?
What does rich lean mean? Rich means you have too much fuel and not enough air. Lean means too much air and not enough fuel. How do I know if I have rich or lean? How do I tell if a carburetor is lean or rich? Heavy black carbon on the exhaust tailpipe would tell you the air-fuel mixture is much too rich. On the flip-side, a blistered or yellowish appearance on spark plug electrodes indicates an overly lean fuel ratio. When does an engine run lean, not rich? Common Misconception: When an engine misfires, the cylinder runs lean, not...