Watching your video it looks to be running out of gas.
As it will run for a while it would seem that the carb
bowl fills up but the supply of fuel is restricted and
cant keep up so the motor stops when the bowl is empty.
What I would suspect from watching your video.
If you let the motor sit for like 10 minuets and it will
start and run again for awhile, that would indicate that is
what is happening.
Tubs
.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.