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    99 200 Mercury EFI same low compression all cylinders?

    I replaced some faulty head gaskets a few months ago and then ran a compression test which tested 112 - 115 psi on all cylinders. It worked great for a while. Gradually , the motor slipped back to the way it was acting before. Checked the compression today and found 60 - 65 psi all cylinders. I...
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    200 mercury efi low compression 2 cylinders

    I have a 99' Merc 200 efi ( # 0G868336)which i recently put in the shop for a smoking problem. The mechanics at the boat shop replaces some gaskets and the thermostat but when I got it out in January, the motor wouldn't get any power. Took it back and did an extensive fuel system overhaul and...
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    99' 200 mercury efi, Low power since repair

    :confused:I took it in to a local place because my motor was smoking, but the power was always there. The shop changed some gaskets, and a thermostat. Ever since then i cant get any horse power, gradually got worse to where its hard to start and keep running. It feels like a fuel starvation...
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    200 hp Mercury low power

    I put my 99' 200 hp mercury efi in the shop in January because the last time i got it out in December it had a smoking problem. The shop fixed the smoking problem , said it was a bad gasket leaking oil into one of the cylinders, also replaced the thermostat and fuel filter. But now i keep...
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