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

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May 18, 2018 at 6:36 pm #76255
Michael Anfossi
Participant

    International Member

    The one plug that is clean had me wondering if water was getting in there. Could drop the lower unit and run it briefly without any water and see if the running quality improves. If it does, you have a water leak somewhere, most likely through the exhaust baffle like Franks says.