This could be caused by worn needles, gummy gas, or sunk floats. But it can also happen to a brand new motorcycle. If one needle sticks, it can fill a cylinder with gas , that then flows past the rings into the oil. Try using some fuel system cleaner in your tank (Chevron Techron will clean the carbs and the motor). But most of all ,when not riding, ALWAYS TURN OFF YOUR FUEL PETCOCK.
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