Without proper quantity of air added???? Maytag, it had the whole atmosphere, there ain't no more than that. lol Have a good one. GeoTrue (john wayne reference) but that is without gas or proper quantities of air added so there is an incomplete burn of the hydrocarbons, thus black smoke. With the gas involved and a carburetor adding air you get a better burn thus no black smoke, thus the fram-i-stat doesn't clog the frangus and cause governmental intervention. LOL
Doubtful, geo's suspicion is the correct one, oil produces a grey/bluish color smoke, but really looks mostly white in bright sunlight. Moisture in the fuel generally will not even meter through the carburetor circuits on most small engines.more likely condesation or water in the tank, dump it out & use fresh mix.