GEO.. Too much choke causes ..black.. smoke! If you are out in the field pulling an implement you should not be applying choke, if you have to something is wrong with your fuel system.
Everytime I start my mowers and tractors, too much choke washes oil off the cylinders. The white smoke stops after I remove the choke.
And yes if the fuel to air ratio isn't right over a long time, it will carbon up the plugs.
White/blue smoke is usually a sign of oil smoke. Black smoke is incomplete combustion.
White smoke on choke in a mower is usually due to the engine running very rich, which means more fuel is being burned than air. Check the air filter for air restrictions, and check for other airflow restrictions including a stuck choke. Other possible causes of white smoke in a push mower include insufficient oil level, oil spilled on the engine, a plugged air filter, AN INCORRECT CHOKE SETTING, a bad engine gasket, or a valve train or piston ring problem.
My Farmall made white/blue smoke when the carb was dripping gas while running. I bought a replacement carb. All is good. Believe what you want, it's a free country.
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