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

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May 28, 2018 at 12:06 am #76871
huntleybill
Participant

    I didn’t think running it outside the water tank for a few min would ruin the impeller. My thought being that if the problem is that its sucking in water, if it is out of the tank, there is no water and therefore the motor should run fine. If it still runs bad, water may not be the problem. but you already knew that.
    Also hdted, compression is 110 on both cylinders, if there is a gasket leak in one of the cylinders, would that not show up during the compression test?