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  1. #1
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    How to ID a Mercury 2.5?

    So I have wanted a Mercury 2.5 for some time now to play with, always keeping my eyes peeled. Anyway I have found a few and one I am interested in. The guy says he bought it brand new in 1997 but "custom built" whatever that means, he doesn't appear to know? And it came to me that I have no idea how to tell these motors appart. Is there any identifications on the blocks to see what they are or started out as, How do we tell a 245 from a 260 or 280? This 1997 I am looking at is supposedly 285hp EFI 20". I will post some pictures.
    Attached Thumbnails Attached Thumbnails 00r0r_72NLf4YVata_1200x900.jpg   00H0H_50gOZ8xaxIa_1200x900.jpg   00q0q_eZ04rpI0Fcd_1200x900.jpg   00u0u_exAqP9Xb5rF_1200x900.jpg   00y0y_cTemgWu30qP_1200x900.jpg  

    outboard 001.jpg   outboard 004.jpg   outboard 005.jpg   outboard 007.jpg  

  2. #2
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    It's a 150-200 efi fishing motor with a CLE and Bridgeport cowl. If it is a 1991 200 by the date on the starter thats a great motor to build something on. But it's not what the says it is. This should be in the tech section btw.

    08 06 of 1991 would probably make it a five petal motor though.

  3. #3
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    powerhead & clamp bracket serial numbers?
    Last edited by FUJIMO; 12-17-2017 at 03:00 PM.

  4. #4
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    Wooops sorry I did not see the tech section, Figured this was the right place as it was for outboards. Thanks for pointing that out.

    I will ask for serial numbers.

    Do all the 260-280HP motors have the intake horn on the front?

  5. #5
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    Yes

  6. #6
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    I asked the guy for proof of the build and pictures of the serial numbers and now he will not reply. I will give him another day or two.

    But yeah with so many variations of these motors, Is there a website to help identify? Do all 280/260 efi motors have that large intake horn?

  7. #7
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    So the seller stopped responding to me for a bit. Just started again, he sent me the bracket serial number and it comes back as a 1991 275hp. Does anyone know where the Serial number on the powerhead is?

  8. #8
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    welch plug between heads possibly

  9. #9
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    The 275 is a 3.4? I could be wrong, if not thats not a Cosworth.

  10. #10
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    He's gonna check the welch plugs now. I have no clue, is there a website that goes over these 2.5's in detail? it is such a popular motor but I've done dozens of hours of research and really can not find any good info on ID'ing these motors or telling the differences. I cant imagine that with something so popular and desirable with so many variations there is not a site with all the info I need. I'll post the 275hp info he sent me shortly, He originally listed it as a 285hp, now listing it as 275hp with mods to make it closer to 285hp. Also it was supposedly "built" in 1997 for a spare motor for a "well known" racing boat that he had bought after that company stopped racing that boat and he put it on a bass boat as an upgrade to his 200hp it previously had. I'm ready to buy this thing but I just want to make sure I'm not buying a 200hp outboard. I'm assuming if this is a 275hp leg/bracket that it would be a great one to have?

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    Here are the bracket pictures
    Attached Thumbnails Attached Thumbnails 367[1].jpg   365[1].jpeg  

  12. #12
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    That is the info he sent me, I found the site and does list that BUT if I put it in on some other sites it shows anything from a 135-200 or XR-4? I'm missing something here on how to ID these motors and parts with them.

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    Can anyone confirm the 275hp is the 3.4? Does the 2.5 fit on a 3.4 Lower? Does anyone know of a good website for information on these?

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    0D057197 1200413LD 1991 MERCURY 200XRI ELPTO

    THis is what the clamp bracket comes back to.

  15. #15
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    Quote Originally Posted by vnemous View Post
    0D057197 1200413LD 1991 MERCURY 200XRI ELPTO

    THis is what the clamp bracket comes back to.

    Thank you so much. I think this guy is just trying to pull a fast one on someone. But as soon as I get some more info on that powerhead I will let you guys know. Thank you.

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