Depends upon the condition of the remaining threads in the aluminum head. He told me part of the plug was still in the head, which is as common as blowing the entire plug out. There is a tool to remove the remaining plug part. If the threads are screwed, then I put a steel helicoil in the head. So, we will see , later today when it gets here. Also wont start, and he put a new battery in it. So that will be first.