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  1. #1
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    Apr 2009
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    Can a 225 proxs be upgraded to a 250 proxs?

    I figured this topic must have been brougt up before, but I couldn't find this using search. If possible, what's involved and what are the costs?


    If it ain\'t broke, don\'t fix it!

  2. Member 302w's Avatar
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    Jun 2004
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    #2

    Re: Can a 225 proxs be upgraded to a 250 proxs? (fishfeardiscajun)

    I have no doubt that you will be able to trade your 225 in and upgrade to a 250.
    Burning the candle at both ends.

  3. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #3

    Re: Can a 225 proxs be upgraded to a 250 proxs? (fishfeardiscajun)

    Can it be done: Yes.

    Should it be done: No, it's indeed illegal to modify the horsepower or emissions footprint of this engine.

    Would it be cost effective to do so: No. Cylinder porting is DIFFERENT (meaning the entire engine would need to be torn down), and PCM calibration is different.

    You would probably come out further ahead to go with the "4-bolt upgrade package" (this is the one that comes with a nice, shiny-new 250 ProXS, complete with a 5-and-Drive warranty package).



    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
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  4. Member low slung cruiser's Avatar
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    #4

    Re: Can a 225 proxs be upgraded to a 250 proxs? (EuropeanAM)

    "4 bolt upgrade package"....
    LOL....love it...nice don
    Sterling 22XS / Mercury Pro XS V8

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