Check to be sure it didn't fill the crank case with gas and thin out the oil. I've seen em fill all the way to the top. Usually doesn't hurt much if you catch it soon enough. It'll sure pump that mess into the intake if it gets bad enough. Sometimes you can smell it in the oil and the oil will look funny/thin. Also if it popping back through the carb/intake from lean condition or ?, it'll soak the air cleaner with an oily mess.