78 50hp merc tune up ?

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Posted by brad ( on June 23, 2005 at 16:38:07:

I have a 78 merc 50 hp and was wondering what the spaek plug gap is new too working on boat motors and was wondering what else i should do before going out on the water for the first time this year and how do I change the gear oil on the motor and what type of oil should i replace it with any help would be greatly appreciated thanks to all for your help

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