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    stevef356's Avatar
    stevef356 Posts: 1, Reputation: 1
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    #1

    Aug 27, 2010, 04:38 PM
    Murray 11hp riding lawnmower engine surge
    Murray 11hp rider... engine surges. Dies out after a few minutes. Put fresh gas/plugs/fuel and air filters/. If I manually play with the linkage for the butterfly, I can keep it running. If I let it alone it dies. Any suggestions? Thanks, Steve
    smoothy's Avatar
    smoothy Posts: 25,490, Reputation: 2853
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    #2

    Aug 27, 2010, 05:15 PM

    Let me guess... you leave gas in it all winter?

    Sounds to me like varnish buildup on the jets causing a lean mixture.

    What I do once a year is get a can of Seafoam and dump it into 5 gallon can of gas I use for the lawn equipment. Yeah that's a heavy does... but it did cure a surging at idle 20 hp Craftsman tractor. And made some old mowers easier to start.

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