I started to do some additional testing and got to the compression test. Looks like my entire engine has low compression. I thought it was odd that all of the sudden, the boat would run like that after sitting over the winter. Will an engine lose compression like after a few months?

I need to do some research as to what to do now. Am I toast? If I remember correctly, low compression on all cylinders might be caused by a slipped timing chain. Any other recommendations other than a full engine overhaul?

I used an autozone compression tester, I want to make sure the tester is functioning properly before I dig too much deeper into the problem.

Here is a video of me testing compression and fuel lines. https://youtu.be/BEM4MJX4L5E