Discussion
Which appearance does a correctly running plug show?
Answer: A
Light tan or grey indicates correct mixture, temperature and heat range. Black soot means rich running or a cold plug, and white blistering means overheating. Reading plugs remains a useful diagnostic skill. The shared behaviour explains why these belong together and the differences explain why both exist. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.
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