Was I cleaned up my bike from the winter today I notice oil stained (not wet just residue) coming out by my pipes between my head gasket. 3 inches long by 1/2 wide. I put a new exhaust system in it last fall could that have been the problem? Or is my head gasket leaking? I degreesed it and the scrubbed it with a tooth brush and I'll see if it comes back. Any suggestions?