Not clear what your asking. I see some evidence of polishing
here and on the flywheel. Rest of the motor looks to be the
normal result of time dulling the shine. If you’re looking to
make the shinny parts match the original patina of the rest of
the motor, a mild acid like that of an aluminum brightener
would knock the shine back some getting you closer.
The aluminum corrodes over time dulling the shine. The
acid in the aluminum brightener accelerates the process.
Tubs
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.