old outboard boat motors??

OK so I know we have a bunch of guys here that live in the south and do a lot of water time in boats
well I just got me an old johnson 4 hp outboard motor
was last used in 1975, and stored in a garage on a motor stand under a blanket
I have not much experience with them, SO< if anyone has any info, please feel free to share it with me
IT a model 4H71D
here is a pic of it

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