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I would keep running the Johnson and save your money. A motor that has not run in 20 years probably is going to need more that just $1000. Plus the Johnson has way more power and is working right now. Maybe store the Yamaha. The absolute worst thing you can do to an outboard is store it. Why did they store the Yamaha? Usually people store a motor because there is something wrong with it. Every rubber seal on that motor is probably toast. Not to mention internal rust. Those old Johnsons where the best motors ever made, way better than the Yamaha. You never see old Yamahas being run but see old Omc outboard everywhere.
Archie