Mercury 20hp-25hp

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  #1  
Old 01-25-10, 05:37 PM
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Join Date: Sep 2004
Location: Saskatchewan
Posts: 175
Mercury 20hp-25hp

I have been told the only difference in a merc 20 horse and a 25 horse is the jetting in the carbs.Is this true?
 
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  #2  
Old 01-25-10, 06:20 PM
Join Date: Mar 2005
Location: USA
Posts: 6,125
Some motors are just de-rated to allow use in waters with a hp limit. Even a 1990 my Merc was available in an 18 hp version to comply with the less than 20 hp limit. There may have been a very minor difference. Some people just bought different decals. That sort of explains the old Johnson and Evinrude motors that were 9.9 hp when they could have been sold as 10 hp models, but the "less than 10 hp" was common on smaller lakes and in remote, protected lakes.

Dick
 
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