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You either have a bad head gasket, or too much oil/ needle valve sticking and allowing gas to sink down into the crankcase. Also, once in a blue moon your air filter will be so dirty that instead of pulling fresh air through the filter, it will take the path of least resistance and pull through...

Make sure that air filter is halfway clean. If the engine can't pull in fresh air through the filter, it'll suck it up through the crankcase breather hose. I've seen this a few times. Just a suggestion.