Well that depends. Was this a good plug cut at rpm, or at idle? If idle, NFG. Was it unleaded fuel? If it was unleaded it will always look black. Is the instrument and thermocouple you're using properly calibrated?
Well that depends. Was this a good plug cut at rpm, or at idle? If idle, NFG. Was it unleaded fuel? If it was unleaded it will always look black. Is the instrument and thermocouple you're using properly calibrated?
katman
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