Re: Mid 50’s Johnson 25HP runs like crap. Advice needed

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May 19, 2018 at 9:19 pm #76343
hdted
Participant

    Corroded reed plate or reeds? Also seems like the top cylinder that’s missing. If top crankshaft seal is bad it could cause fuel charge for top cylinder to leak off through roller bearing. Just a thought. Also I have seen bad head gasket or exhaust cover gasket to cause the problem by leaking water into the cylinder. The plug you are holding on the bottom indicates water getting into the cylinder.