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    25hp EFI merc, No compression?

    I have a 2006 merc 25hp 4/stoke EFI ( OR107138 ) This engine will not run or even pop. i checked compression with throttle wide open and can only get about 10psi on all 3 cylinders. what could be causing this? i know this engine has decompression valves built on the cam but i should get more...
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