Re: Water Getting in Top Cylinder Yamaha 40hp Twin

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June 1, 2016 at 1:39 pm #37533
Don
Participant

    US Member
    quote rickrodt:

    Check for a broken reed on the top cylinder…..same thing happened to me on a 6 horse OMC motor. Drove me crazy. With the reed gone, the top cylinder acts like a pump and sucks the water up into the cylinder from the exhaust manifold dump.

    Another excellent point! It is amazing how messed up exhaust pulses can pull water back into a combustion chamber…This always amazed me on stern drive engines also.