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    Mercury 90 Loss of power above 4200 RPM

    Here are pictures of the surface of the pontoons. I am starting to wonder if this rough surface could make a lot of difference. It looks like caked on mud, but it does not wipe off.
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    Mercury 90 Loss of power above 4200 RPM

    Thank you for the reply. I have tried having a buddy pump the primer bulb while running and it made no difference. The primer bulb is new and pumps gas well and firms up normally when squeezing it. I though fuel starvation too, but I have redone basically the whole fuel system. The pods have no...
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    Mercury 90 Loss of power above 4200 RPM

    I have a new to me 2009 Mercury 90 hp, 2 stroke, ELPTO 1090412FY serial # 1B780051 It starts well, idles pretty well, a little rough. It accelerates well and powers up quickly to about 4200 RPM, which is maybe 3/4 throttle. If I push the throttle past 4200 rpm the engine loses a small amount of...
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    Troubleshoot Mercury 90 bogs over 4200 rpm

    Thank you. I cleaned the carburetor, it looked perfect with no crud or blocked jet. I will have a buddy pump the primer bulb when at full throttle. The rag test was done on muffs. I will look in to checking the fuel pump.
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    Troubleshoot Mercury 90 bogs over 4200 rpm

    Compression test shows 120, 118, 120
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    Troubleshoot Mercury 90 bogs over 4200 rpm

    2009 Mercury 90 Hp 2 stroke ELPTO Will not get above 4200 RPM and not getting expected high end speed/power, and has a rough idle. I did the "rag test", covering each carburetor in turn. The engine dies when I cover the inlet of the top and middle carburetor, but continues to run when I cover...
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