Light White Smoke? Could It Be From Running Rich

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White smoke could be steam caused by coolant or water getting to the combustion chamber.

Pull all the spark plugs and compare the color to see if there are any irregularities. Comparing the color of the plugs can tell you things sometimes. If particular plugs appear cleaner than others, that could be the cylinder where water is getting in. The steaming affect of the water burning off cleans the combustion chamber of carbon deposits.