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 | My father used to own a 1986 merc 50 hp that had trouble all the time...carbs, electrical, you name it.  He decided to pull out his old 1973 Johnson 20 hp and it started on the 3rd pull.  Had the carb readjusted just a touch and it was good to go...and that was after sitting for 10+ years.  Those 30 year old motors in many ways were more reliable than the motors of today.  They were simplistic in design with few parts to go wrong. 
 I'd trust that 32 year old motor with my life.
 
 Much of it goes into how well the motor has been taken care of.
 
 I'll bet that if your old motor is in nice shape and never had problems 15 years ago, it will purr like a kitten almost right away..
 
 Steve
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