I was replacing the air filter on a 25 hp kawasaki horizontal motor this afternoon and noticed oil in the intake area of the carburator. What would be the cause of this? Also, I had a leaky head gasket so i change that too. But when I had the head off, i noticed one of the rockers was more loose than the other. I know they have different tolerances but this one seemed quite loose. I may be worring for nothing but does someone have any input?