I HAVE A BRIGGS AND STRATTON 5550 WATT GENERATOR 10 HP THAT WAS RUNNING WELL AND MY SON FILLED IT AND SINCE THEN IT SMOKES TERRIBLY WHEN RUNNING AND WILL ONLY RUN FOR SHORT PERIODS BEFORE CHOKING OUT. I FOUND OIL IN THE AIR FILTER AREA AND OIL COMES OUT OF THE LINE FROM THE OHV TO THE CARB.
You have/had too much oil in it. After it is brought down to proper level, it may have to burn the oil that is in areas that it should not be in. Another thing that may cause this, is a dirty air filter, can cause enough suction to pull oil around valves, and other places a clean filter will not. It may have oil in the filter too.
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