RE: Engine gets really hot
Nothing to worry about contrapiston are falling out of cylinder head...
I had never lost the contrapiston with o-ring fitted out of cylinderhead. The sign before the contrapiston with o-ring fitted are too lose from cylinderhead: The oil are coming out of compression screw.
I replaced the o-ring at my OS 10 FP Marine after 8-10 year use, discovered oil was leaking out of compression screw.
Jens Eirik