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85 20hp surges after it warms up

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  • 85 20hp surges after it warms up

    my 20 wont run right for me, it starts up and runs great for just a few minutes, then it all of a sudden bogs down and starts a surging and stalling never dies just revs up and down and wont go. If I let it sit for a while(30 minutes) it will start right up and run fine... for a couple minutes.

    Replaced the coils with a known good set-no help
    new plugs-no help
    basic carb clean-no help

    What is the most likely cause? don't wanna just throw money at it. Help,please im at my wits and wallets end...

  • #2
    Thats usually starving for fuel, check to see if primer is sucking flat if so then have a fuel restriction, try bumping choke to see if can keep it running.
    Regards
    Boats.net
    Johnson Outboard Parts

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