Your motor looks like it could be binding in part of its rotation.
I think I can hear it dragging – scraping on something when you’re
rocking it back and forth? Take out the spark plugs and rotate the
motor. It should be smooth all around. If not you need to find out
why not.
Tubs.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.