My Z80 keeps unscrewing the spark plug while flying. Even with the set screw that locks the shield in place intact. There does not seem to be any problem with the threads in the head.
Is this a sign that it is overheating? I don't have any baffleing but there is plenty of air openings in the cowl. Its fully cowled.
Has anyone had and fixed this problem? If so what did you do to fix it?