I was having fuel leaking out of my carburetor so I am going to replace the o-ring in the bowl. When I removed my air filter assembly, it had a sludge pooled up in it. It looked like the consistency of oil and gas. This, in a car, would be due to a bad PCV valve. Does my 2000 honda shadow vlx deluxe 600 CD have a PCV valve? If not, what could be causing this?