Re: Would an outboard motor always be repairable?
Nick, it will not be a good business venture unless you are retired, don't need the money and your time is worth 0.
Remember, too, the learning curve. If you buy a non-operating motor, there are dozens of reasons why it won't work--some are related and some are independent. Then there are dozens more reasons why it doesn't work well, once you get it started. You don't have the experience yet to have instinct, and OB motors are just different.
Unlike most car engines, OB motors are tough on the nuts. What I mean is, they freeze, seize and lock up, and the heads ring off. usually there is one you can't get to without removing a bunch of other stuff, like the lower cowl, and then you encounter more frozen nuts/bolts, screwed into fragile pot metal that crumbles in your hands.
Old motors that have been worked on previously contain mysteries known only to God and the previous mechanic, and neither is talking. I have a mysterious mid-80's Johnson that runs like a scalded dog but no one can identify the year(s) of the parts and there is this mysterious weld on the side of the head.
Consider your top recovery. If you get a broken down OB for $100 and fix it up so it's running, you are selling an old motor with a max sale price of a few hundred dollars.
Start with an old motor that is running and try to take it apart and put it back together, maybe do a carb job, water pump or lower unit seals. That should cure you.
You have 2 independent questions: one is getting on the water cheap (answer: start with a running motor) and the other is starting a business in which you have no experience (Answer: just run).