I had my motor rebuild about a year ago. I ride a 96 softtail with an 80" evo. I did have an andrews ev-27 cam installed. I have a problem with oil coming out of my air cleaner after rideing in the mountians. It seems like when I am under load going up the hills it looses some power. Also I don't have the oil coming out of the air cleaner when I am just riding on flat ground not going up hills and putting the motor under extra load. Is this common with the evo?