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    2005 Mercury 50hp 2 cycle surging under power

    i have a Milton compassion tester not calibrated. I used no oil. The gauge could be off but all cylinders are close and assumed on the higher end?
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    2005 Mercury 50hp 2 cycle surging under power

    The prop is not in good shape. I question if the prop could be cavitating. But at steady speed rpm goes up and down, once it started to cavita I didn’t think it would stop?
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    2005 Mercury 50hp 2 cycle surging under power

    Spec is 170 to 200 psi
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    Why am I getting threads on my gmail and on iboats formums

    All I did was register did not know about preference will check that out now thanks!
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    Why am I getting threads on my gmail and on iboats formums

    Also threads are not in order?
  6. L

    2005 Mercury 50hp 2 cycle surging under power

    I was wondering if crank seals could be leaking messing with the mixture in the crank?
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    2005 Mercury 50hp 2 cycle surging under power

    Compression is 200psi in all 3 cylinders just check last week
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    2005 Mercury 50hp 2 cycle surging under power

    Dewittng 87 there are two inputs to the fuel pump one from the upper cylinder and one under the pump itself from 3rd cylinder not sure what you mean. Your saying remove the line from top cylinder?
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    2005 Mercury 50hp 2 cycle surging under power

    I took fuel line at carb off and cranked it. It’s pumping fuel not a crazy amount but pumping fuel. I looked for a volume but could not find anything
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    2005 Mercury 50hp 2 cycle surging under power

    JimBo I’ve replaced 2 fuel pumps pulled the tank outlet tube replaced the primer ball checked the fuel line connector at the motor, replaced the fuel line to the pump. It seem to still be starving for fuel?
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    2005 Mercury 50hp 2 cycle surging under power

    goofed up sorry
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    2005 Mercury 50hp 2 cycle surging under power

    it will stop surging when I pump the ball. Like I’m forcing gas into the carb bowls?
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    2005 Mercury 50hp 2 cycle surging under power

    Seam to be misfiring or just not running smooth. I replaced the line from top cylinder to fuel pump.
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    2005 Mercury 50hp 2 cycle surging under power

    Thanks for reading! Driving the pontoon at 3k rpm will drop to 2k then back to 3k then to 2.5k and so on. I pump the ball and the rpm will stabilize. I have replaced the tank primer ball and fuel pump. Also pulled the fuel pickup and it was spotless, Carburetors have been rebuilt twice by two...
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