1977 merc 70 h.p. in question

markemark

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Jun 20, 2009
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Hi everyone, I'm new to this today and really need some help.

I have purchased a 1977 forester boat and motor, the boat is originally rated for a 60 h.p.
the owner before me claimes he had put a 70 h.p. merc and changed the stickes to 60 h.p. but it lookes like a 50 h.p. to me. I have searched several sites with the serial number and have had no luck.
serial num is 4978985 with 3 pistons.

please help,
markemark:
 
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