Reply To: Vintage Mercury Racer ID Help Needed

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July 5, 2019 at 9:56 pm #178469
outboard315
Participant

    There should be a serial number on top of the cylinders or on the flange separating the front and back of the block.

    Yes the mark 15, 20, and 25 are dimensionally the same from the exterior. I am leaning towards a KH7 though. I think the fuel pump is bolted to the shifter boss since I don’t see a fuel pump boss on the opposite side. Not sure where it is pulling vacuum from though.