1977 9.9 hp Johnson hard starting when warm

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    jerryswiss


    Replies: 32
    Topics: 20
    #208713

    Recently picked this motor up.
    Condition:
    -Compression both cylinders 80 psi (at 4800 ft elev.)
    – Carb soaked and cleaned, new Welch plug
    – Set Low speed needle in test tank
    -Impeller pumping plenty of water, warm, not hot tell-tale
    -Starts easy when cold with choke
    -Tested it on the boat today, started easy, runs good at all speeds

    ***Shut motor off. Could not get it to restart.
    – Took it home put back in test tank and when it is warmed up it is hard to restart. Will restart with low throttle setting and no choke. Takes 6-8 pulls of the rope.

    Is the 80 psi low for this motor? Is that the problem or is it something else?

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