Honda crf250 1998 2 stroke?

Cylinder head exhaust port worn and leaking, there's suppose to be two groves in the exhaust port in which two rubbers seals seat into but on one side of the port its completely worn flat! Any ideas other than replacing the cylinder head?

There's a whole lot wrong with this question. First off two stroke engines don't have exhaust ports in the head and there's no way any exhaust port could have rubber O-rings, they would burn in a minute. You want try again?

Head is shot.