Mixed gas and altitude

[GEEZER]

I used to have the same problem at Fish Lake with my old 1953 Johnson 5 hp. I.d even adjust the mixture leaner & all that but after a while the thing would start acting up. I only experienced this problem if I was trolling. A guy in Salina told me to try one or two steps hotter plugs. Problem solved. What he told me was that the cold water at Fish Lake kept the plugs too cold & they would begin fouling.

I absolutely WOULD NOT run a leaner oil / gas mixture unless I had an oil that was formulated to run at those mixtures and even at that, if I did I would mix a little to the richer side just to be on he safe side.
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