Do not run the engine until you find the problem. Check the vacuum operated fuel pump at bottom of fuel tank. If the diaphragm is ruptured it will allow fuel to drain into the crank case through the vacuum line into the intake manual. Smell the oil and if it smells of fuel drain the engine immediately repair the problem then refill the engine with clean oil. My son's buggy had done this and it destroyed the cylinder, cam and heads valve guided in very short time. I replaced the pump with just a petcock to keep it from happening again.
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