well fellas i will tell you that its white smoke steam like.and we did a pressure test with zero drop replaced carb runs smooth.all plugs look good and no signs of water or coolant in the combustion chamber.i looked at the oil and again no signs of water.nothing coming out of the tailpipe.
With your descriptions of symptoms, you likely have a tiny coolant leak into a cylinder which is not big enough to affect performance, and would take a while to show a loss in the radiator. A tiny leak will steam clean the combustion chamber and the spark plug. I would recommend you take another look at all of the plugs. Rather than looking for water, look for one of them which is cleaner than the others. If you were to pull the head, you would likely find one cylinder with a very clean piston top.
Carl
