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Is the carburetor dripping when the motor is shut off? If not, then I highly doubt that it is a carburetor problem unless the mixture screws are really out of adjustment. The reason is that as has been previously said, it has an updraft carburetor which would generally prevent gas as a liquid getting into the cylinders. Now, if the engine is running too rich (lots of black smoke from the exhaust), or has very poor compression (which is indicated by the smokey mist coming out of the breather) all the fuel may not be getting burned up and pushed by the rings into the crankcase. Usually if an engine is run long enough and warmed up good the gas will evaporate out and you won’t notice it in the oil, but if the engine is run short periods of time, it will tend to collect in the oil. Others are correct about changing the oil, since gasoline (especially ethanol blends) has a tendency to remove oil from the places it needs to be. Not good. After you change the oil run that engine for an hour or so and get it warmed up, check to see if you still are getting gas in the oil. If not, then it’s pretty likely coming past the rings either due to starting and stopping the engine before it is warmed up, poor compression, or too rich a setting on the mixture screws.
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