Re: 82' 50 HP MERCURY?
The 44 cubic inch Merc fours are great motors - they made them from the late 1950s until the mid 1990s. Two weak points. The impeller is relatively light-duty on these. Change it (and use a Merc brand) unless you're positive it was just changed. Secondly, the stator has low & high speed windings for charging the ignition powerpack. In my experience, the low-speed windings tend to burn out on the original stators. Rapair makes a well-designed aftermarket replacement, and I suspect Merc replacement parts have better cooling as well. The other things to look for a pretty generic to outboards; compression should be closely equal cylinder-to-cylinder; 44s like to wind so prop it so it turns 5500-6000 rpm with you alone in the boat; etc.. Good luck!