Re: Evinrude 4hp Compression Testing

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July 6, 2015 at 5:41 pm #19585
Don
Participant

    US Member

    Yeah, that is pretty low for a 4hp, these engines have higher compression than the older 3hps. You might try a different compression gage, readings can be inaccurate on these small combustion chambers.
    Once the reading is verified to be only 50PSI, I would pull the head. Hopefully just a blown head gasket.