Re: 1963 EVINRUDE 40HP RETEST AND EVALUATION (PART 2)

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December 14, 2015 at 1:21 am #28582
frankr
Participant

    It clearly is consuming fuel faster than it can be supplied. Is it my imagination, or is it running too rich at high speed? Wrong or drilled out high speed jet (orifice plug)? Choke not completely open?

    Fuel pump test gauges don’t cost much. Usually combined with a vacuum gauge. Tee it in between the fuel pump and carburetor to settle the supply question. It should maintain around 2.5 PSI @ 4000 rpm.