Is there supposed to be oil inside the right side engine case? I am doing a service on the quad for a guy because it has sat for a while and when I went to start it up there was a sort of grinding/starter not catching sound. I looked at the right side and noticed that he had duct taped over 3 rather large puncture wounds in the case . I took it off and not a drop of oil came out and a good bit of surface rust is present. any and all help and or comments are apreciated!