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  1. #1
    Cadet
    Join Date
    Oct 2008
    Posts
    1

    Default Mercury 75 hp 4 stroke to 90 hp

    I recently purchased a 2002 17 ft lund with a 75 hp 4 stroke merc knowing it was a bit underpowered but the price was right.The mecury manual says that the bore ,stroke ,displacement is exactly the same for 75 hp and 90 hp.In fact the only difference in the specs is the rated hp and rpm (75 hp runs 4500 to 5500 max and 90 hp runs 5000 to 6000.Seems like it may be a simple task to upgrade the hp. Could anyone tell me if this is possible and what parts would need to be changed. (electronics ,carbs jets etc)

  2. #2
    Moderator JB's Avatar
    Join Date
    Mar 2001
    Location
    The Hideout, Whitt, TX, USA
    Posts
    45,903

    Default Re: Mercury 75 hp 4 stroke to 90 hp

    It would be cheaper to sell the 75 and buy a 90.

  3. #3
    Seaman Apprentice
    Join Date
    Dec 2007
    Location
    florida
    Posts
    32

    Default Re: Mercury 75 hp 4 stroke to 90 hp

    the difference would the engine control module and possibly the jetting in the carbs...

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