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  1. #1
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    SOLD. Super nice 225 Promax

    Mercury Racing 225 Promax with essentially a new powerhead. Engine was built with a new factory block, piston kits (WSM with 1.5mm rings), steel cage rod bearings, all new electrical components (regulators, stator, trigger & switch boxes). A32 ECU that was just serviced at Simon motorsports w/ a year warranty. New TDR reeds, injectors cleaned & flowed. All new cooling components - poppet valve, thermostats & waterpump. The engine has about 15 hours on it for break-in, testing and tuning. Factory Promax midsection, Alien Style Factory light weight cowls. Ratcheting 1.87 lower unit with welded Bobs cone lower water pickup and torque tab on skeg. Probably forgetting a bunch. The motor looks new and run great. A Promax I built that is identical to this one peaked at 242 HP on the dyno. The only reason Iím selling it as I just bought my old 280 back and something has to go. Motor can be demonstrated and installation is available. Trades-ins of similar Mercury outboards will be considered. $7800 Firm, Call or Text me (Mark) at 757-84six-897one.

    Click image for larger version. 

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    Go Time
    2003XS GS 225 Promax/ 260 / 280
    26 Regulator twin 250 EFI

  2. Likes tux974, Frank Molť liked this post
  3. #2
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    You have leak-down numbers?

  4. #3
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    UPDATED COMPRESSION READINGS. Readings were taken with engine warm and throttle open. Also verified the readings with 2 different Snap-on compression gages. They didn't change much from the original cold readings.
    Leakdown was less than 4%.

    Compression
    1-145#
    2-144#
    3-149#
    4-148#
    5-148#
    6-144#

    Leakdown
    1- 3%
    2- 3%
    3- 2%
    4- 3%
    5- 2%
    6- 3%
    Go Time
    2003XS GS 225 Promax/ 260 / 280
    26 Regulator twin 250 EFI

  5. #4
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    Back to the top. This powerhead is exceptionally clean and runs great. Built with all top shelf components. High quality piece.
    Go Time
    2003XS GS 225 Promax/ 260 / 280
    26 Regulator twin 250 EFI

  6. #5
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    Fat shaft or small shaft lower

  7. #6
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    Smallshaft
    Go Time
    2003XS GS 225 Promax/ 260 / 280
    26 Regulator twin 250 EFI

  8. #7
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    Quote Originally Posted by Go Time View Post
    Mercury Racing 225 Promax with essentially a new powerhead. Engine was built with a new factory block, piston kits (WSM with 1.5mm rings), steel cage rod bearings, all new electrical components (regulators, stator, trigger & switch boxes). A32 ECU that was just serviced at Simon motorsports w/ a year warranty. New TDR reeds, injectors cleaned & flowed. All new cooling components - poppet valve, thermostats & waterpump. The engine has about 15 hours on it for break-in, testing and tuning. Factory Promax midsection, Alien Style Factory light weight cowls. Ratcheting 1.87 lower unit with welded Bobs cone lower water pickup and torque tab on skeg. Probably forgetting a bunch. The motor looks new and run great. A Promax I built that is identical to this one peaked at 242 HP on the dyno. The only reason Iím selling it as I just bought my old 280 back and something has to go. Motor can be demonstrated and installation is available. Trades-ins of similar Mercury outboards will be considered. $7800 Firm, Call or Text me (Mark) at 757-84six-897one.
    242hp is spot on. We have tested two on the dyno. Nice piece for sure @ $7800

  9. #8
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    Thanks Greg
    Go Time
    2003XS GS 225 Promax/ 260 / 280
    26 Regulator twin 250 EFI

  10. #9
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    Back to the top. Come on...you know you want it.
    Go Time
    2003XS GS 225 Promax/ 260 / 280
    26 Regulator twin 250 EFI

  11. #10
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    What charging system and flywheel does it have?

  12. #11
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    The charging system is a factory 40 amp system but with the lighter factory red flex plate flywheel ( used on the early model 40 amp systems). The flywheel has been indexed. The engine is essentially stock with some minor component upgrades. And before anyone asks, the heads are factory stock, not cut. I do have some other heads available to the buyer.
    Go Time
    2003XS GS 225 Promax/ 260 / 280
    26 Regulator twin 250 EFI

  13. #12
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    Those are really great compression numbers for stock heads and block.

    Really nice package you got there....
    James H. W2F a V-King... Want 2 Fly a V-King

    Dedicated Site for Hydrostreams >> http://hydrostreamforums.com/
    My Project 1979 V-King restore >> http://hydrostreamforums.com/viewtopic.php?f=9&t=2761

  14. #13
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    Updated Post #3 with recent hot compression numbers and verified gage.
    Go Time
    2003XS GS 225 Promax/ 260 / 280
    26 Regulator twin 250 EFI

  15. #14
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    Stock from factory they should b lower no...?
    11757 btw lol

  16. #15
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    Quote Originally Posted by Go Time View Post
    UPDATED COMPRESSION READINGS. Readings were taken with engine warm and throttle open. Also verified the readings with 2 different Snap-on compression gages. They didn't change much from the original cold readings.
    Leakdown was less than 4%.

    Compression
    1-145#
    2-144#
    3-149#
    4-148#
    5-148#
    6-144#

    Leakdown
    1- 3%
    2- 3%
    3- 2%
    4- 3%
    5- 2%
    6- 3%
    That is one strong Promax

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