Re: GAMEFISHER 7.5 NEED YEAR
225 means it's a Force motor. 581750 is 1988 7-1/2Hp, 591750 is not shown. Interestingly, the only year Force offered that model under their own name is 1985. A manual for that would do nicely. A Merc dealer may be able to order one for you. Otherwise Google Sears Parts and have that model number handy. (Sears# OB4214-1 Owner's Manual)
