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

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May 15, 2018 at 11:44 am #76013
frankr
Participant

    I think you are barking up the wrong tree (carb tree). There is something wrong with that top cylinder. You claim the spark is not the issue, so look for something else. Crankcase sealing? Water getting into cylinder? Scored piston? Busted reed? But first double check the ignition.

    The smoke is because the top cylinder is not burning its fuel, but is discharging it into the exhaust.