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    2001 merc 150efi 2 stroke tempature

    Just purchased 21’ boat with a 2001 merc 150efi 2 stroke. I changed both thermostats with oem thermostats. Finally got boat on water and the temperature gauge(new) appears to be all over the map. Up to about 225 and then anywhere from that to 150. Is that common? I never had a gauge...
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    1989 Merc 70 check valve

    When I was running motor in the yard I noticed a small valve leaking oil blow the carbs but on the block. I check online and it’s labeled check valve. No hose was loose or evident. Is it just for testing? not sure. Don’t want to cap till I know and or run a tube but can’t find where the other...
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