Arnaldo Pessina : First: This yellowish color represent water contents/droplet in fuel, when burnt, the result shown on spark plug.Fuel quality is not up to standard. -OR-
as far, you are already not using Declain TCP.
Second: This yellowish color may result of water discharge (droplet) in combustion chamber from crankcase any other coolant water areas . Humid environments where your aircraft being uses.
Arnaldo Pessina : First: This yellowish color represent water contents/droplet in fuel, when burnt, the result shown on spark plug.Fuel quality is not up to standard. -OR-
as far, you are already not using Declain TCP.
Second: This yellowish color may result of water discharge (droplet) in combustion chamber from crankcase any other coolant water areas . Humid environments where your aircraft being uses.
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