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Thread: How to ID a Mercury 2.5?
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12-16-2017, 08:34 PM #1Member
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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.
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12-17-2017, 03:13 AM #2
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.
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12-17-2017, 02:55 PM #3The Historic Photo Master
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powerhead & clamp bracket serial numbers?
Last edited by FUJIMO; 12-17-2017 at 03:00 PM.
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12-18-2017, 10:08 AM #4Member
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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?
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12-28-2017, 07:25 AM #5
Yes
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12-28-2017, 09:17 AM #6Member
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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?
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01-13-2018, 02:33 PM #7Member
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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?
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01-13-2018, 03:18 PM #8
welch plug between heads possibly
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01-13-2018, 03:25 PM #9
The 275 is a 3.4? I could be wrong, if not thats not a Cosworth.
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01-13-2018, 03:32 PM #10Member
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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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01-13-2018, 03:38 PM #11Member
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Here are the bracket pictures
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01-13-2018, 03:49 PM #12Member
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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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01-13-2018, 05:09 PM #13Member
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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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01-13-2018, 06:14 PM #14
0D057197 1200413LD 1991 MERCURY 200XRI ELPTO
THis is what the clamp bracket comes back to.
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01-13-2018, 06:44 PM #15Member
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