Hello, I have a 1981 cme 400 and I just changed the head gasket on it. After about 500km oil started from the back and the front of the cylinder. Oil is not leaking from the gaskets. I inquired and was told by honda dealeship to replace the two head bolts that have a short rubber sleeve above the threads. I have done this and oil still leaks out. I have a parts engine, 81 cb400, and the simirlaly placed head bolts on this engine have no rubber sleeve. Can anyone out there shed any light on this? Could the cylinder be cracked? Thanks