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    mariner 90hp serial number help

    I recently bought a 90hp mariner outboard. I was told it was a 1990. The serial number on the plate reads OC2500071, but on the metal disk pressed into the motor it reads B2500071. Which is the correct serial number and why are the different? Is this a 1990 motor?<br />Thanks in advance!
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    lower unit swap?

    I have a 1989 merc 90hp outboard with a blown cylinder. By a stroke of luck I found a replacement motor that was cheaper than having my powerhead rebuilt. I replaced it with a 1990 90hp mariner motor. The new motor runs get but it is not in as good shape as far as upkeep as my old one...
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    mercury vs mariner

    I have a 1990 model year 90hp mercury outboard that has a bad cylinder. To replace it I picked up a used 1990 90hp mariner outboard. They look like almost identical motors with the exception of the carberator. Can anyone tell me what the differences are?
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