Here are some pictures (I only have pictures)
of what looks to be the same power head as
yours branded as a Schnake Mid-Jet. It is also
a jet drive motor but a different configuration
than yours. As mentioned by others your motor
doesn’t seem to have some of the shroud used to
direct the air around the cylinder for cooling that
this motor has. It would seem though that if your
motor ever had these there should be holes.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.