4.3 merc 175hp wont go over 25mph

have a 1987 merc 175 hp and it wont go over 25 mph. i put new fuel filter in and still wont go. I went from a 19 pitch to 21 pitch prop but dont think that would affect it that much. any suggestions would be great.

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Jun 15, 2014
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25 mph
by: Don

I haven't had a outboard for a lot of years but ,
Do you have the rpm's? Is the nose way up in the air or is the nose plowing ,that sounds more like it .
If it's plowing rise the lower unit out 2 notches.
See what that does. It's a boat just keep working
you will get it . Don

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